Re: [Qemu-devel] PC BIOS Flash emulation

[Dmitry Zamaruev]

On Wed, Mar 7, 2012 at 6:32 PM, Avi Kivity <address@hidden> wrote:
> On 03/07/2012 03:59 PM, Dmitry Zamaruev wrote:
>> Hi,
>>
>> I'm trying to emulate BIOS Flash chip (something Intel FWH compatible)
>> on PC target (i386-softmmu) and to verify possibility of such
>> emulation I first tried to use pflash_cfi02 example from PPC platform.
>
> So is Jordan (copied).
>
>> Trying to use if following way:
>> in hw/pc.c in pc_memory_init() after bios.bin is loaded and mapped to ISA 
>> space:
>>
>>     cpu_register_physical_memory(0x100000 - isa_bios_size,
>>                                  isa_bios_size,
>>                                  (bios_offset + bios_size -
>> isa_bios_size) | IO_MEM_ROM);
>>
>>     option_rom_offset = qemu_ram_alloc(NULL, "pc.rom", PC_ROM_SIZE);
>>     cpu_register_physical_memory(PC_ROM_MIN_VGA, PC_ROM_SIZE,
>> option_rom_offset);
>>
>>     /* map all the bios at the top of memory */
>> //    cpu_register_physical_memory((uint32_t)(-bios_size),
>> //                                 bios_size, bios_offset | IO_MEM_ROM);
>>
>> Instead of mapping all the bios at the top of memory I'm using
>> following piece of code to init pflash device and load bios into it:
>>
>>     dinfo = drive_get(IF_PFLASH, 0, 0);
>>     if (dinfo) {
>>         bios_size = bdrv_getlength(dinfo->bdrv);
>>         bios_offset = qemu_ram_alloc(NULL, "fwh.bios", bios_size);
>
> You're using a really old version of qemu.  Please use qemu.git instead,
> the APIs have changed.

I'm using Q35 "version" from Isaku Yamahata, the only available
version is 0.14.50. So I cannot use HEAD because Q35 support not in
mainstream yet.
But I will try this particular problem with HEAD to see if this
approach works there. Thanks.

wbr,
Dmitry.