Setting up U-Boot: Difference between revisions

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== LX60 and LX200 U-Boot Installation ==


''('''News:''' The New DC233, with the V3 MMU, is now working. Work is in progress with the Linux 2.6.29-smp kernel to boot from this updated U-Boot.
'''Summary:'''
[http://www.denx.de/wiki/UBoot U-Boot] is a very popular boot loader; especially within the [http://elinux.org/Bootloader Embedded Linux community].
The U-Boot loader runs on the FPGA boards which are equipped with a dip switch, number 8, which can select where the memory location for the reset
vector (0XFE00,0000) comes from. With switch number 8 off the board will map the memory at the reset vector to a small block of SRAM located in the
I/O block with the UART and Ethernet buffer memory. When switch number 8 is on the Avnet boards map the beginning of the Flash Memory at 0XF800,000
to the reset vector at 0xFE00,000.
What we are going to do here is build a version of U-Boot for your Avnet board and Variant, install that ELF file into memory
with xt-gdb and run U-Boot. Then we are going to download a another copy of this identical program with '''tftp'''. The version we
are going to download is just the ELF file with the headers and debug information removed. It's just the actual bits that get
loaded into memory. For the new V3 MMU the default '''loadaddr''' is typically 0x20,0000 and for the older V2 MMU this is in the
Linux mapping equivalent, 0xD0200,0000. The default location can be change by setting the U-Boot 'loadaddr' environment variable
or by changing the variable '''CONFIG_SYS_LOAD_ADDR''' in the boards U-Boot config file.
Once the virgin copy of the U-Boot program has been loaded into memory, the Flash memory is un-protected and errasd, then the
memory with the U-Boot program in it is copied to the flash memory and protected. Next you will set dip switch 8 on, recycle
power on the board, and U-Boot will be accessible via the serial UART at 38400 baud. U-Boot works without any MMU mapping,
and should be fine on configurations without an MMU. Only an ethernet and serial interface are required.
'''Proceedure:'''
A local port to the Xtensa architecture is now available at linux-xtensa.org.  See [http://git.linux-xtensa.org/cgi-bin/git.cgi?p=u-boot/u-boot-xtensa.git;a=summary U-Boot Sources (GIT Summary)].  Or, to access this tree using <tt>git</tt> directly, use something like:
  $ '''git clone git://git.linux-xtensa.org/git/u-boot/u-boot-xtensa.git u-boot'''
  $ '''cd u-boot'''
''('''Note:'''  This path is subject to change.)''
The U-Boot git repository has a branch with a HiFi 2 snapshot made for
the LX200 [[SMP HiFi 2 Development Board]]. With this branch you can simply check
out the snapshot_2+SMP branch which includes the binaries which are discussed below:
  $ '''git clone git://git.linux-xtensa.org/git/u-boot/u-boot-xtensa.git u-boot'''
  $ '''cd u-boot'''
  $ '''git branch --track snapshot_2+SMP origin/snapshot_2+SMP'''
  $ '''git checkout snapshot_2+SMP'''
  $ '''ls -l u-boot u-boot.bin tools/mkimage'''
    -rwxr-xr-x 1 piet tensilica  45016 2009-12-07 19:40 tools/mkimage          [This is a small program you need to put in your search path to build kernel U-Boot images]
    -rwxr-xr-x 1 piet tensilica 635339 2009-12-07 19:40 u-boot                  [Started with xt-gdb to bring up the 1st instance of a HiFi 2 U-Boot]
    -rwxr-xr-x 1 piet tensilica 144944 2009-12-07 19:40 u-boot.bin              [Loaded by the 1st instance of U-Boot, it's a HiFi2 version of u-boot that will be put in flash]
  $
Unless you are using a U-Boot snapshot you need to build U-Boot for which you must have built the Buildroot toolchain for XTensa core.
Set your PATH to point to the toolchain built using buildroot. For example:
  $ '''export PATH="''<workdir>''/buildroot/build_xtensa_''<cname>''/staging_dir/usr/bin:$PATH"'''
where '''<cname>''' is the name of the Xtensa core variant you wish to build for (e.g., <tt>dc232b</tt> <tt>dc233c</tt>).
To build U-Boot, use the cloned git tree pulled above, you should be at the top level of the tree in the '''u-boot''' directory ,  then configure it for your board and Xtensa core variant as follows:
make distclean
make <cname>'''_<board>_'''config
'dc232b'dc
This should only take a few seconds. For example, to build U-boot for the 'xtav60' board and the older 'dc232b' core with the V2 MMU type:
  $ '''cd u-boot'''
  $ '''make dc232b_xtav60_config'''                                  [NOTE: You can skip this step with the the HiFi-2 snapshot_2+SMP branch; binaries are pre-built]
or for the new 'dc233c' core with the new V3 MMU type:
  $ '''make dc233c_xtav60_config'''                                  [NOTE: You can skip this step with the the HiFi-2 snapshot_2+SMP branch; binaries are pre-built]
or for a 'xtav200' board type with the new 'dc233c' core type:
  $ '''make dc233c_xtav200_config'''                                [NOTE: You can skip this step with the the HiFi-2 snapshot_2+SMP branch; binaries are pre-built] 
or for the snapshot_2+SMP branch you can also build U-Boot for the HiFi 2 core:
  $ '''make test_mmuhifi_c3_xtav200_config'''                        [NOTE: You can skip this step with the the HiFi-2 snapshot_2+SMP branch; binaries are pre-built]
Only boards and core variants currently supported in the tree can be built out of the box. Headers for supported cores can be found in the tree under <tt>include/asm-xtensa/variant-<cname></tt>. The core specific headers are described in the <tt>doc/README.xtensa</tt> file. To support a new core, these headers must be copied from the overlay in the same way as for the linux kernel.
After the configuration step, to actually build U-Boot, simply:
  $ '''make all'''                                                  [NOTE: You can skip this step with the the HiFi-2 snapshot_2+SMP branch; binaries are pre-built]
This will take a quite a few minutes.
Next, start xt-gdb and load u-boot from the top of the git repository:
 
  $ '''xt-gdb -n'''                                                  [NOTE: Even with the HiFi 2 snapshot_2+SMP branch you still may have to put U-Boot on the board]           
  (xt-gdb) '''file u-boot'''
  (xt-gdb) '''target remote localhost:20000 0'''
  (xt-gdb) '''reset'''
  (xt-gdb) '''load'''
  (xt-gdb) '''break panic'''
  (xt-gdb) '''continue'''
Hopefully U-Boot will start, and display on the LCD in the case of a LX60.
  U-Boot 50.00 Mhz
Often you will be starting with the boards flash in an unknown state and it's best to unprotect and erase the entire flash. Just type '''protect off all''' followed by '''erase all''':
    U-Boot> '''protect off all'''
    Un-Protect Flash Bank # 1
    ................................................................................................................................... done
    U-Boot>  '''erase all'''
    Erase Flash Bank # 1
    ..........................................................................................................
    Flash erase timeout at address f8d40000 da0
    Flash erase error at address f8d40000
    ........................ done
    U-Boot>
The timeout and error messages are likley just warning messages and you board has been errased. You can see that with the flash info command '''flinfo'''. Below is an example with a LX200 board, which has a much larger flash than the smaller LX60:
  U-Boot> '''flinfo'''
    Bank # 1: CFI conformant FLASH (16 x 16)  Size: 16 MB in 131 Sectors
      Intel Extended command set, Manufacturer ID: 0x89, Device ID: 0x18
      Erase timeout: 4096 ms, write timeout: 1 ms
      Buffer write timeout: 2 ms, buffer size: 64 bytes
      Sector Start Addresses:
      F8000000 E      F8020000 E      F8040000 E      F8060000 E      F8080000 E
      F80A0000 E      F80C0000 E      F80E0000 E      F8100000 E      F8120000 E
      F8140000 E      F8160000 E      F8180000 E      F81A0000 E      F81C0000 E
      F81E0000 E      F8200000 E      F8220000 E      F8240000 E      F8260000 E
      F8280000 E      F82A0000 E      F82C0000 E      F82E0000 E      F8300000 E
      F8320000 E      F8340000 E      F8360000 E      F8380000 E      F83A0000 E
      F83C0000 E      F83E0000 E      F8400000 E      F8420000 E      F8440000 E
      F8460000 E      F8480000 E      F84A0000 E      F84C0000 E      F84E0000 E
      F8500000 E      F8520000 E      F8540000 E      F8560000 E      F8580000 E
      F85A0000 E      F85C0000 E      F85E0000 E      F8600000 E      F8620000 E
      F8640000 E      F8660000 E      F8680000 E      F86A0000 E      F86C0000 E
      F86E0000 E      F8700000 E      F8720000 E      F8740000 E      F8760000 E
      F8780000 E      F87A0000 E      F87C0000 E      F87E0000 E      F8800000 E
      F8820000 E      F8840000 E      F8860000 E      F8880000 E      F88A0000 E
      F88C0000 E      F88E0000 E      F8900000 E      F8920000 E      F8940000 E
      F8960000 E      F8980000 E      F89A0000 E      F89C0000 E      F89E0000 E
      F8A00000 E      F8A20000 E      F8A40000 E      F8A60000 E      F8A80000 E
      F8AA0000 E      F8AC0000 E      F8AE0000 E      F8B00000 E      F8B20000 E
      F8B40000 E      F8B60000 E      F8B80000 E      F8BA0000 E      F8BC0000 E
      F8BE0000 E      F8C00000 E      F8C20000 E      F8C40000 E      F8C60000 E
      F8C80000 E      F8CA0000 E      F8CC0000 E      F8CE0000 E      F8D00000 E
      F8D20000 E      F8D40000 E      F8D60000 E      F8D80000 E      F8DA0000 E
      F8DC0000 E      F8DE0000 E      F8E00000 E      F8E20000 E      F8E40000 E
      F8E60000 E      F8E80000 E      F8EA0000 E      F8EC0000 E      F8EE0000 E
      F8F00000 E      F8F20000 E      F8F40000 E      F8F60000 E      F8F80000 E
      F8FA0000 E      F8FC0000 E      F8FE0000 E      F8FE8000 E      F8FF0000 E
      F8FF8000 E
    U-Boot>
Now set your preliminary U-Boot environment variables to point to your TFTP server so we can download yet another copy of U-Boot. At Tensilica we use a machine in the RTOS group called rtos-lab2. Folks using the [[SMP HiFi 2 Development Board]] likely have set up their workstation with a TFTP server.     
    U-Boot> '''setenv serverip 192.168.11.78'''          rtos-lab2
or
    U-Boot> '''setenv serverip 192.168.11.55'''          pdelaney_fc9
    U-Boot> '''setenv ipaddr 192.168.11.95'''            I/P address of RTOS5, Piet's LX60; MAC: 00:05:C2:13:6f:0a
    U-Boot> '''setenv bootfile u-boot.bin'''
    U-Boot> '''saveenv'''
    Saving Environment to Flash...
    .... done
    Un-Protected 4 sectors
    Erasing Flash...
    .... done
    Erased 4 sectors
    Writing to Flash... done
    .... done
    Protected 4 sectors
    U-Boot>
Next, download '''u-boot.bin''' from the tftp server using the info we just entered into U-Boot's enviroment variables.
Here for example is the case for a LX60 running the HiFi-2 Bitstream with the older V2 MMU. Note that it starts up
in the D-gazillion (0XD0000000) region:
    U-Boot> '''tftpboot'''
    TFTP from server 192.168.11.78; our IP address is 192.168.11.95
    Filename 'u-boot.bin'.
    Load address: 0xd2000000
    Loading: T ########
    done
    Bytes transferred = 107592 (1a448 hex)
For the V3 MMU U-Boot is loaded from host pdelaney_fc9 into memory with virtual == physical. Here is a DC233L, with V3 MMU, example:
    U-Boot> '''tftpboot'''
    Using open_ethernet device
    TFTP from server 192.168.11.55; our IP address is 192.168.11.95
    Filename 'u-boot.bin'.
    Load address: 0x2000000
    Loading: T ########
    done
    Bytes transferred = 109964 (1ad8c hex)
    U-Boot>
Now things get a bit tricky here for the LX60. The FLASG has '''Two sizes of Flash Sectors'''.
The first 8 sectors are small 0x2000 (8KB) and apparently intended for parameters. The rest
of the 4MB flash is composed of larger 0x10000 (64KB) sectors.  Our code doesn't differentiate
between the sectors and the LX60 hardware is going to map 0XF800,0000 to 0XFE00,0000 so this
makes us use of all 8 of the 8KB sectors and the 1st 64KB sector at F8010000. So we are going
to flash up to F801FFFF below.
On a LX200 we have much more space and can easily fit a version of U-boot that has been compiled without optimization, make debugging much easier.
So in this case the image is a bit larger, but relatively similar to the LX60 (2 sectors):
    U-Boot> '''tftpboot'''
    Using open_ethernet device
    TFTP from server 192.168.11.78; our IP address is 192.168.11.95
    Filename 'u-boot.bin'.
    Load address: 0xd2000000
    Loading: ###############
    done
    Bytes transferred = 205852 (3241c hex)
    U-Boot>
Note that for both the LX200 and the LX60 that the image size, '''(3241c hex)''' in this case, is a bit less than 0x40000 or 10 sectors,
so turn off protection on the 1st 11 sectors and
erase the current contents.
For the '''LX60''' you do this:
  U-Boot> '''protect off F8000000 F801FFFF'''
  ... done
  Un-Protected 2 sectors
  U-Boot> '''erase F8000000 F801FFFF'''
        erase F8000000 F801FFFF
        ... done
For the '''LX200''' the starting address '''(F8000000)''' is the same as with the LX60 but the last addesss '''(F803FFFF)''' is 'twice' as high:
  U-Boot> '''protect off F8000000 F803FFFF'''
  ... done
  Un-Protected 2 sectors
  U-Boot> '''erase F8000000 F803FFFF'''
  Erased 2 sectors
  U-Boot>
Now copy the the image of u-boot.bin in memory to the flash. For the XL60 with the '''OLD''' V2 MMU you copy 0x20000
bytes from 0xd2000000 to 0XF8000000:
  U-Boot> '''cp.b d2000000 F8000000 20000'''
  Copy to Flash... done
For the LX60 with the '''NEW''' V3 MMU you copy 0x24000 bytes from 0x2000000 to F8000000:
  U-Boot> '''cp.b 2000000 F8000000 20000'''
  Copy to Flash... done
For the LX200 you copy 0x40000 bytes from 0xd2000000 to 0XF8000000...0XF803FFFF:
  U-Boot> '''cp.b d2000000 F8000000 40000'''
  Copy to Flash... done
Finally we protect these sectors so that U-Boot isn't easily erased by accident.
Below is what it looks like on a LX60 with the New V3 MMU with a subsequent display of the flash info:
    U-Boot> '''cp.b 2000000 F8000000 2000'''
    Copy to Flash... done
    U-Boot> flinfo
    Bank # 1: CFI conformant FLASH (16 x 16)  Size: 4 MB in 71 Sectors
      AMD Standard command set, Manufacturer ID: 0x20, Device ID: 0x2257
      Erase timeout: 8192 ms, write timeout: 1 ms
      Sector Start Addresses:
      '''F8000000        F8002000        F8004000        F8006000        F8008000'''
      '''F800A000        F800C000        F800E000        F8010000        '''F8020000 E
      F8030000 E      F8040000 E      F8050000 E      F8060000 E      F8070000 E
      F8080000 E      F8090000 E      F80A0000 E      F80B0000 E      F80C0000 E
      F80D0000 E      F80E0000 E      F80F0000 E      F8100000 E      F8110000 E
      F8120000 E      F8130000 E      F8140000 E      F8150000 E      F8160000 E
      F8170000 E      F8180000 E      F8190000 E      F81A0000 E      F81B0000 E
      F81C0000 E      F81D0000 E      F81E0000 E      F81F0000 E      F8200000 E
      F8210000 E      F8220000 E      F8230000 E      F8240000 E      F8250000 E
      F8260000 E      F8270000 E      F8280000 E      F8290000 E      F82A0000 E
      F82B0000 E      F82C0000 E      F82D0000 E      F82E0000 E      F82F0000 E
      F8300000 E      F8310000 E      F8320000 E      F8330000 E      F8340000 E
      F8350000 E      F8360000 E      F8370000 E      F8380000 E      F8390000 E
      F83A0000 E      F83B0000 E      F83C0000 E      F83D0000 E      F83E0000
      '''F83F0000  RO'''
    U-Boot> '''protect on F8000000 F802FFFF'''
    .......... done
    Protected 10 sectors
    U-Boot>
   
    U-Boot> '''flinfo'''
    Bank # 1: CFI conformant FLASH (16 x 16)  Size: 4 MB in 71 Sectors
      AMD Standard command set, Manufacturer ID: 0x20, Device ID: 0x2257
      Erase timeout: 8192 ms, write timeout: 1 ms
      Sector Start Addresses:
      '''F8000000  RO  F8002000  RO  F8004000  RO  F8006000  RO  F8008000  RO
      F800A000  RO  F800C000  RO  F800E000  RO  F8010000  RO'''  F8020000 E
      F8030000 E      F8040000 E      F8050000 E      F8060000 E      F8070000 E
      F8080000 E      F8090000 E      F80A0000 E      F80B0000 E      F80C0000 E
      F80D0000 E      F80E0000 E      F80F0000 E      F8100000 E      F8110000 E
      F8120000 E      F8130000 E      F8140000 E      F8150000 E      F8160000 E
      F8170000 E      F8180000 E      F8190000 E      F81A0000 E      F81B0000 E
      F81C0000 E      F81D0000 E      F81E0000 E      F81F0000 E      F8200000 E
      F8210000 E      F8220000 E      F8230000 E      F8240000 E      F8250000 E
      F8260000 E      F8270000 E      F8280000 E      F8290000 E      F82A0000 E
      F82B0000 E      F82C0000 E      F82D0000 E      F82E0000 E      F82F0000 E
      F8300000 E      F8310000 E      F8320000 E      F8330000 E      F8340000 E
      F8350000 E      F8360000 E      F8370000 E      F8380000 E      F8390000 E
      F83A0000 E      F83B0000 E      F83C0000 E      F83D0000 E      F83E0000 
      '''F83F0000  RO'''
    U-Boot>
Below is what it looks like on a LX200 with the V2 MMU with a subsequent display of the flash info.
Notice that the Flash Sectors are 10X as large on the LX200:
  U-Boot> '''protect on F8000000 F802FFFF'''
    .. done
    Protected 2 sectors
    U-Boot> '''flinfo'''
    Bank # 1: CFI conformant FLASH (16 x 16)  Size: 16 MB in 131 Sectors
      Intel Extended command set, Manufacturer ID: 0x89, Device ID: 0x18
      Erase timeout: 4096 ms, write timeout: 1 ms
      Buffer write timeout: 2 ms, buffer size: 64 bytes
      Sector Start Addresses:
      '''F8000000  RO  F8020000  RO'''  F8040000 E      F8060000 E      F8080000 E
      F80A0000 E      F80C0000 E      F80E0000 E      F8100000 E      F8120000 E
      F8140000 E      F8160000 E      F8180000 E      F81A0000 E      F81C0000 E
      F81E0000 E      F8200000 E      F8220000 E      F8240000 E      F8260000 E
      F8280000 E      F82A0000 E      F82C0000 E      F82E0000 E      F8300000 E
      F8320000 E      F8340000 E      F8360000 E      F8380000 E      F83A0000 E
      F83C0000 E      F83E0000 E      F8400000 E      F8420000 E      F8440000 E
      F8460000 E      F8480000 E      F84A0000 E      F84C0000 E      F84E0000 E
      F8500000 E      F8520000 E      F8540000 E      F8560000 E      F8580000 E
      F85A0000 E      F85C0000 E      F85E0000 E      F8600000 E      F8620000 E
      F8640000 E      F8660000 E      F8680000 E      F86A0000 E      F86C0000 E
      F86E0000 E      F8700000 E      F8720000 E      F8740000 E      F8760000 E
      F8780000 E      F87A0000 E      F87C0000 E      F87E0000 E      F8800000 E
      F8820000 E      F8840000 E      F8860000 E      F8880000 E      F88A0000 E
      F88C0000 E      F88E0000 E      F8900000 E      F8920000 E      F8940000 E
      F8960000 E      F8980000 E      F89A0000 E      F89C0000 E      F89E0000 E
      F8A00000 E      F8A20000 E      F8A40000 E      F8A60000 E      F8A80000 E
      F8AA0000 E      F8AC0000 E      F8AE0000 E      F8B00000 E      F8B20000 E
      F8B40000 E      F8B60000 E      F8B80000 E      F8BA0000 E      F8BC0000 E
      F8BE0000 E      F8C00000 E      F8C20000 E      F8C40000 E      F8C60000 E
      F8C80000 E      F8CA0000 E      F8CC0000 E      F8CE0000 E      F8D00000 E
      F8D20000 E      F8D40000 E      F8D60000 E      F8D80000 E      F8DA0000 E
      F8DC0000 E      F8DE0000 E      F8E00000 E      F8E20000 E      F8E40000 E
      F8E60000 E      F8E80000 E      F8EA0000 E      F8EC0000 E      F8EE0000 E
      F8F00000 E      F8F20000 E      F8F40000 E      F8F60000 E      F8F80000 E
      F8FA0000 E      F8FC0000 E      '''F8FE0000  RO  F8FE8000  RO  F8FF0000  RO'''
      '''F8FF8000  RO'''
    U-Boot>
Note that the U-Boot '''saveenv''' command Erased and protected the last four sectors
of this LX200.
On both the LX60 and the LX200 now move DIP switch 8 to the ON position, power cycle the board. On the LX60 you should see U-boot in the LCD display.
The '''LX60''' with the new V3 MMU the serial console should print something like the following:
 
  U-Boot 2009.08-dirty (Sep 10 2010 - 18:23:26)
    CPU:    Xtensa dc233c at 50.00 MHz
    Board:  XT-AV60: Avnet board + Xilinx LX60 FPGA + Tensilica bitstream
    SysRAM: 64 MB
    Flash:  4 MB
    In:    serial
    Out:  serial
    Err:  serial
    MAC:    00:50:C2:13:6f:0a
    IP:    192.168.11.95
    open_ethernet
    U-Boot>   
On the '''LX200''', shown below with the old V2 MMU, you should see something like the following. In this case we also show the flash info command, '''flinfo''', being invoked just after booting U-Boot:
  CPU:    Xtensa test_mmuhifi_c3 at 41.6777 MHz
    Board:  XT-AV200: Avnet board + Xilinx LX200 FPGA + Tensilica bitstream
    SysRAM: 96 MB
    Flash: 16 MB
    In:    serial
    Out:  serial
    Err:  serial
    MAC:
    IP:    192.168.11.95
    U-Boot>
    U-Boot> '''flinfo'''
    Bank # 1: CFI conformant FLASH (16 x 16)  Size: 16 MB in 131 Sectors
      Intel Extended command set, Manufacturer ID: 0x89, Device ID: 0x18
      Erase timeout: 4096 ms, write timeout: 1 ms
      Buffer write timeout: 2 ms, buffer size: 64 bytes
      Sector Start Addresses:
      '''F8000000  RO  F8020000  RO'''  F8040000 E RO  F8060000 E RO  F8080000 E RO
      F80A0000 E RO  F80C0000 E RO  F80E0000 E RO  F8100000 E RO  F8120000 E RO
      F8140000 E RO  F8160000 E RO  F8180000 E RO  F81A0000 E RO  F81C0000 E RO
      F81E0000 E RO  F8200000 E RO  F8220000 E RO  F8240000 E RO  F8260000 E RO
      F8280000 E RO  F82A0000 E RO  F82C0000 E RO  F82E0000 E RO  F8300000 E RO
      F8320000 E RO  F8340000 E RO  F8360000 E RO  F8380000 E RO  F83A0000 E RO
      F83C0000 E RO  F83E0000 E RO  F8400000 E RO  F8420000 E RO  F8440000 E RO
      F8460000 E RO  F8480000 E RO  F84A0000 E RO  F84C0000 E RO  F84E0000 E RO
      F8500000 E RO  F8520000 E RO  F8540000 E RO  F8560000 E RO  F8580000 E RO
      F85A0000 E RO  F85C0000 E RO  F85E0000 E RO  F8600000 E RO  F8620000 E RO
      F8640000 E RO  F8660000 E RO  F8680000 E RO  F86A0000 E RO  F86C0000 E RO
      F86E0000 E RO  F8700000 E RO  F8720000 E RO  F8740000 E RO  F8760000 E RO
      F8780000 E RO  F87A0000 E RO  F87C0000 E RO  F87E0000 E RO  F8800000 E RO
      F8820000 E RO  F8840000 E RO  F8860000 E RO  F8880000 E RO  F88A0000 E RO
      F88C0000 E RO  F88E0000 E RO  F8900000 E RO  F8920000 E RO  F8940000 E RO
      F8960000 E RO  F8980000 E RO  F89A0000 E RO  F89C0000 E RO  F89E0000 E RO
      F8A00000 E RO  F8A20000 E RO  F8A40000 E RO  F8A60000 E RO  F8A80000 E RO
      F8AA0000 E RO  F8AC0000 E RO  F8AE0000 E RO  F8B00000 E RO  F8B20000 E RO
      F8B40000 E RO  F8B60000 E RO  F8B80000 E RO  F8BA0000 E RO  F8BC0000 E RO
      F8BE0000 E RO  F8C00000 E RO  F8C20000 E RO  F8C40000 E RO  F8C60000 E RO
      F8C80000 E RO  F8CA0000 E RO  F8CC0000 E RO  F8CE0000 E RO  F8D00000 E RO
      F8D20000 E RO  F8D40000 E RO  F8D60000 E RO  F8D80000 E RO  F8DA0000 E RO
      F8DC0000 E RO  F8DE0000 E RO  F8E00000 E RO  F8E20000 E RO  F8E40000 E RO
      F8E60000 E RO  F8E80000 E RO  F8EA0000 E RO  F8EC0000 E RO  F8EE0000 E RO
      F8F00000 E RO  F8F20000 E RO  F8F40000 E RO  F8F60000 E RO  F8F80000 E RO
      F8FA0000 E RO  F8FC0000 E RO  '''F8FE0000  RO  F8FE8000  RO  F8FF0000  RO'''
      '''F8FF8000  RO'''
    U-Boot>
Note that the 1st two sectors with U-Boot saved in them came up as not being erased ('''E''') but that all sectors came up Read Only ('''RO''').
Same with the last four sectors that the U-Boot '''saveenv''' command Erased. This is likely a '''bug''' on the LX200 boards with some preliminary investigation.
We will be discussing this with the U-Boot developers sometime in the future prior to pushing our U-boot changes upstream.
If U-Boot fails to boot you might try making sure the '''serverip'' matches the address of the tftp server where
you have copied your u-boot.bin''' file to and comparing the bits in the flash that got mapped to 0xfe00,0000 to what in the file:
u-boot]$ od -t x4  u-boot.bin | more
    .0000000 00000206 fe000040 ffffffff a0fffe21
    .0000020 00000002 fe01ad14 fe01ad8c 03f95030
    .0000040 03f9aa78 04000000 00040003 03f8147c
    .0000060 03f81418 00000000 00000000 00000000
    .0000100 5300000c 13a00013 4800130c 13493013
    .0000120 0c130200 13e62032 22002010 a03200a0
    .0000140 1d837680 82037282 72822372 63728243
    .0000160 72007272 72720872 18727210 2201d222
    .0000200 020c80c2 3d80a032 1d8376f0 d20372d2
    .0000220 72d22372 6372d243 f20072f2 72f20872
    .0000240 1872f210 2201d222 200080c2 ffd92100
    .0000260 37ffda31 02481d12 22681258 145722cb
    .0000300 ee1467f1 664b0678 444b0479 06f43457
    .0000320 0000fff8 31ffd221 4320ffd2 40443bc0
    .0000340 84764142 4b020903 32020c22 837680a0
    .0000360 04728211 82247282 72824472 01d22264
    .0000400 1180c222 c821ffc8 13e620ff 41002010
    .0000420 04d0ffc7 ffc64100 fffffd86 1049c500
    .0000440 e52049d5 49f53049 00003400 00000000
    .0000460 00000000 00000000 00000000 00000000
    .
    .(gdb) x/100x 0xfe000000
    .0xfe000000 <_ResetVector>: 0x00000206      0xfe000040      0xffffffff      0xa0fffe21
    .0xfe000010 <_ResetVector+16>:      0x00000002      0xfe01ad14      0xfe01ad8c      0x03f95030
    .0xfe000020 <_ResetVector+32>:      0x03f9aa78      0x04000000      0x00040003      0x03f8147c
    .0xfe000030 <_ResetVector+48>:      0x03f81418      0x00000000      0x00000000      0x00000000
    .0xfe000040 <_start>:              0x5300000c      0x13a00013      0x4800130c      0x13493013
    .0xfe000050 <_start+16>:            0x0c130200      0x13e62032      0x22002010      0xa03200a0
    .0xfe000060 <_start+32>:            0x1d837680      0x82037282      0x72822372      0x63728243
    .0xfe000070 <_start+48>:            0x72007272      0x72720872      0x18727210      0x2201d222
    .0xfe000080 <_start+64>:            0x020c80c2      0x3d80a032      0x1d8376f0      0xd20372d2
    .0xfe000090 <_start+80>:            0x72d22372      0x6372d243      0xf20072f2      0x72f20872
    .0xfe0000a0 <_start+96>:            0x1872f210      0x2201d222      0x200080c2      0xffd92100
    .0xfe0000b0 <_start+112>:          0x37ffda31      0x02481d12      0x22681258      0x145722cb
    .0xfe0000c0 <_start+128>:          0xee1467f1      0x664b0678      0x444b0479      0x06f43457
    .0xfe0000d0 <_start+144>:          0x0000fff8      0x31ffd221      0x4320ffd2      0x40443bc0
    .0xfe0000e0 <_start+160>:          0x84764142      0x4b020903      0x32020c22      0x837680a0
    .0xfe0000f0 <_start+176>:          0x04728211      0x82247282      0x72824472      0x01d22264
    .0xfe000100 <_start+192>:          0x1180c222      0xc821ffc8      0x13e620ff      0x41002010
    .0xfe000110 <_reset+1>:            0x04d0ffc7      0xffc64100      0x00fffd86      0x1049c500
    .0xfe000120:                        0xe52049d5      0x49f53049      0x00003400      0x00000000
    .0xfe000130:                        0x00000000      0x00000000      0x00000000      0x00000000
    .(gdb)
Further details on U-Boot in general are in the generic <tt>README</tt> at the top of the U-Boot tree. Details specific to the Xtensa architecture are in <tt>doc/README.xtensa</tt>. Details specific to a board are in <tt>board[/<family>]/<board>/README</tt> (for example <tt>board/avnet/xtav60/README</tt>).

Latest revision as of 23:31, 2 March 2018

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