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Re: [PATCH qemu v7 0/5] spapr: Kill SLOF

From: Alexey Kardashevskiy
Subject: Re: [PATCH qemu v7 0/5] spapr: Kill SLOF
Date: Fri, 21 Feb 2020 11:18:13 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.2

On 20/02/2020 21:01, Paolo Bonzini wrote:
> On 20/02/20 07:16, Alexey Kardashevskiy wrote:
>> This is another attempt to implement minimalistic
>> Open Firmware Client Interface in QEMU.
>> With this thing, I can boot unmodified Ubuntu 18.04 and Fedora 30
>> directly from the disk without SLOF.
>> A useful discussion happened esrlier:
>> https://lore.kernel.org/qemu-devel/address@hidden/
>> 5/5 is kind of controvertial though. This respin does not include
>> networking.
>> This is based on sha1
>> 015fb0ead60d Chen Qun "hw/ppc/virtex_ml507:fix leak of fdevice tree blob".
> I would like to play with this.  Can you provide a disk image that just
> reads the first sector of the disk using an OpenFirmware read command,
> and dumps it to stdout?

I am not quite sure I understood the request.  Write my own small
firmware and replace GRUB with it? The firmware from 5/5 reads first 2
sectors and the entire PReP, I could add there stuff if that helps (I
have "work in progress" patch for the firmware with printk/etc borrowed
from SLOF).

>  (Also, I lost the pointer to your super-minimal
> pSeries firmware).

It is incorporated into these patches under /pc-bios/vof - 4/5 has the
minimum (may be even too much), 5/5 has MBR+GPT+ELF.


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