Xtensa on QEMU
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Setting up and running Xtensa simulation on QEMU
QEMU is a free processor/machine emulator and virtualizer.
Starting with version 1.0 QEMU offers Xtensa architecture emulation. DC232B (LE) and fsf (BE) cores are supported on sim and LX60/LX200 platforms.
Getting and building QEMU
QEMU is developed using git. The main tree is located at http://git.qemu.org/qemu.git. Release tarballs and guest systems images are available at http://wiki.qemu.org/Download.
This will make a copy of master QEMU repository, configure, build and install QEMU binaries for little-endian and big-endian targets:
$ git clone git://git.qemu.org/qemu.git $ mkdir qemu-xtensa ; cd qemu-xtensa $ ../qemu/configure --prefix=`pwd`/root --target-list=xtensa-softmmu,xtensaeb-softmmu $ make install
QEMU options
| Option | Meaning | Example |
|---|---|---|
| -M <machine-name> | Emulate specific platform type. Use '?' to list all supported platform types. | -M lx60 |
| -cpu <core-name> | Emulate specific core type. Use '?' to list all supported core types. | -cpu dc232b |
| -m megs | Set emulated RAM size to megs MB | -m 128 |
| -semihosting | Enable SIMCALL instruction for the protection ring 0. | -semihosting |
| -kernel <elf-image> | Load elf-image and start emulation from its entry point. Note that image is loaded to virtual addresses it is linked for. For LX60/LX200 this option also chooses 'boot from SRAM' mode, mapping SRAM to the System ROM region at physical address 0xFE000000. | -kernel xtensa-2.6.29-smp/arch/xtensa/boot/Image.elf |
| -append <kernel arguments> | (Not for sim platform) Wrap kernel arguments into the bootparameters block and pass pointer to it to the elf-image in a2. | -append 'console=ttyS0 ip=dhcp root=/dev/nfs rw' |
| -pflash <flash-image> | (Not for sim platform) Mount flash-image as a system FLASH. Note that image size must match platform FLASH size (4MB for LX60, 16MB for LX200). | -pflash u-boot.dc232b_xtav200.flash |