Re: [Qemu-devel] [U-Boot] Support of latest qemux86-64

[Anton Gerasimov]

To whoever might be interested: I've bisected qemu and the breaking
commit is 208fa0e43645edd0b0d8f838857dfc79daff40a8 (pc: make 'pc.rom'
readonly when machine has PCI enabled). It's just three lines added,
I'll paste the whole patch here. Not quite sure what can we do here though.


  diff --git a/hw/i386/pc.c b/hw/i386/pc.c
  index 22e16031b0..59435390ba 100644
  --- a/hw/i386/pc.c
  +++ b/hw/i386/pc.c
  @@ -1443,6 +1443,9 @@ void pc_memory_init(PCMachineState *pcms,
       option_rom_mr = g_malloc(sizeof(*option_rom_mr));
       memory_region_init_ram(option_rom_mr, NULL, "pc.rom", PC_ROM_SIZE,
                              &error_fatal);
  +    if (pcmc->pci_enabled) {
  +        memory_region_set_readonly(option_rom_mr, true);
  +    }
       memory_region_add_subregion_overlap(rom_memory,
                                           PC_ROM_MIN_VGA,
                                           option_rom_mr,


Thanks,
Anton


On 11/06/2017 02:55 AM, Bin Meng wrote:
> +QEMU dev list
>
> On Fri, Nov 3, 2017 at 10:07 PM, Anton Gerasimov
> <address@hidden> wrote:
>> Hi all,
>>
>> I'm trying to use u-boot (v2017.01) with qemu-system-x86_64 v2.10.0 and
>> run into a "trying to execute code outside of RAM or ROM at xxxxx"
>> issue. It happens both when I build and use u-boot as a bios and as EFI
>> payload, just the addresses in the error message are different. On qemu
>> v2.5.0 at least EFI option works fine.
>>
>> I understand that it can be (and probably is) a QEMU issue, but maybe
>> someone on the list already encountered it and knows a workaround or has
>> successfully used u-boot with QEMU >=2.10.0 and can share their experience.
>>
> Yes, I just tested latest U-Boot x86 ROM image with QEMU 2.9.1 and
> 2.10.1. The same U-Boot ROM image boots with 2.9.1 but not with
> 2.10.1.
>
> I built U-Boot as follows:
>
> $ make qemu-x86_defconfig
> $ make
>
> Does anyone have any hints?
>
> Regards,
> Bin


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