On Wed, 20 Oct 2021, Thomas Huth wrote:
> On 20/10/2021 14.43, Cédric Le Goater wrote:
>
>> The 405 machine are still close to deprecation I think. We are still
>> struggling to boot one with mainline Linux, using uboot provided by
>> Thomas which skips SDRAM init. It is not clear to me if u-boot is
>> strictly necessary. It depends if Linux relies on it to do some
>> pre-initialization of HW. I guess once we find a good DTS for it, or
>> not, we can take a decision.
>
> FWIW, seems like this tarball contains a dts for a "taihushui" 405ep board:
>
> https://dev.archive.openwrt.org/raw-attachment/ticket/4153/kolsch.tranzeo.openwrt.bsp.tar.bz2
>
> ... I wonder whether that's the same board as the "taihu" board in QEMU?

The corresponding ticket has some info on the machine:

https://dev.archive.openwrt.org/ticket/4153.html

but it's not clear what taihu in QEMU is in the first place. The comment 
in ppc405_boards.c says it's an evaluation board so most likely the above 
one may have been designed based on this reference board. Some info on the 
eval board can be found here:

http://www.welcm.com/amccTaihu/amccTaihu.htm
https://datasheet.octopart.com/EV-460GT-KIT-03-AMCC-datasheet-11746697.pdf
https://happytrees.org/files/chips/datasheets/product_selector_guide--AMCC--PowerPC.pdf

I wonder what ref405ep was then, an earlier or later or different version?

Regards,
BALATON Zoltan