Re: [PATCH 00/15] ppc/ppc405: decade cleanup

[Cédric Le Goater]

On 12/6/21 11:36, Cédric Le Goater wrote:
> Hello,
>
> The goal of these changes is to refresh the QEMU ref405ep machine and
> enable boot from a Linux kernel without relying on a U-Boot firmware.
> The reason for doing so is that we are unable to find a "ppc405_rom.bin"
> firmware image or a flash image for the 405EP machines.
>
> Thomas fought is way through on a v2015.10 U-Boot and taihu defconfig
> and provided a compatible image available here :
>
>   https://gitlab.com/huth/u-boot/-/tree/taihu/
>
> With this image, QEMU reaches the U-Boot prompt (with a simple
> workaround in the SDRAM).
>
> On the Linux side, the only available 405EP CPU board is the one for
> the ESTeem 195E (PPC405EP) SBC (hotfoot). It was added in 2009. The
> board information structure in Linux, in U-Boot and in QEMU are not in
> sync and the hotfoot board also adds its own flavor because the FW was
> an ancient U-Boot without dual ethernet support [1].
>
> For this kernel to be loaded by the U-Boot image provided by Thomas,
> we either need to modify U-Boot or Linux. The same question arise for
> QEMU, see the last patch of this series which is controversial. Please
> advise !

Applied patch 1-14 to ppc-next.

I kept the hotfoot hack for later. We need to fix user space first.

Thanks,

C.