[U-Boot] [ppc] qemu-ppce500 howto

[Alon Bar-Lev]

On Sun, May 25, 2014 at 2:16 PM, Alexander Graf <agraf at suse.de> wrote:
>
> On 25.05.2014, at 13:10, Alon Bar-Lev <alon.barlev at gmail.com> wrote:
>
>> On Sun, May 25, 2014 at 1:08 PM, Alexander Graf <agraf at suse.de> wrote:
>>>
>>>
>>> On 24.05.14 09:23, Alon Bar-Lev wrote:
>>>>
>>>> On Thu, May 22, 2014 at 12:04 PM, Alexander Graf <agraf at suse.de> wrote:
>>>>>
>>>>>
>>>>> On 22.05.14 09:52, Alon Bar-Lev wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Trying to run the qemu-ppce500 within qemu. I am using -bios u-boot.bin and no luck, I get live signal.
>>>>>>
>>>>>> I am using latest u-boot master and qemu master.
>>>>>>
>>>>>> Command:
>>>>>> $ ./qemu-system-ppc -M ppce500 -nographic -bios u-boot.bin
>>>>>>
>>>>>> Tried to load u-boot as well, same.
>>>>>
>>>>>
>>>>> Yes, that command should work with the right patches :). Unfortunately they are not in master yet, but instead waiting in my queue:
>>>>>
>>>>>   https://github.com/agraf/qemu
>>>>>
>>>>> Please give things a try with the ppc-next branch in there. That should get things working for you.
>>>>>
>>>> WORKING! thanks!
>>>>
>>>> Is there any support for flush and/or mtd for this target (-drive
>>>> if=pflash, -mtdblock)?
>>>
>>>
>>> I haven't implemented pflash yet, sorry. Do you need the flash device for configuration storage or as backing storage for your kernel?
>>>
>>
>> Well, I wish both... :)
>>
>> boot qemu as if it were a target....
>>
>> 1. put u-boot on pflash, and boot from it.
>> 2. have backing storage for kernel (can be mtd).
>> 3. have data partition (can be mtd).
>>
>> we can skip (1) as -bios is good enough... but for (2), (3) I do not
>
> For (2) you can use the -kernel option. It should make the payload's physical address available through an environment variable. If it's a uImage, it will get loaded automatically.
> For (3) you can use all the emulated block storage options QEMU provides, such as virtio-pci or ahci.
>

ahci works, thanks I did not know this notation is possible:

qemu .... \
 -device ahci,id=ahci0 \
 -drive  if=none,file=/tmp/img1,format=raw,id=drive-sata0-0-0 \
 -device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,id=sata0-0-0

Now I see mass storage device on pci bus.

Thanks for the reference!

Now, I am almost sure we are missing commands within the u-boot
configuration to allow accessing the ide/scsi, fsinfo and friends.

>> see solution but have either mtd or other block device support... is
>> that possible?
>
> It's definitely possible, yes :). I simply didn't implement any mtd device emulation so far in the QEMU machine model. But patches are definitely welcome!
>

I would have glad to... However, unfortunately, I am not at that level... :(

Thanks!
Alon