Hi Chen-Yu and Andre, thank you for your input. On 01.01.25 09:58, Chen-Yu Tsai wrote:
IIRC we have chosen against adding explicit MMC aliases for the sunxi platforms. Please try using UUID= or PARTUUID= for root partition references.
I see, no problem. Out of curiosity, what is the reason for this decision? I couldn't find related discussions on the mailing list.
Personally, I like the UUID= or PARTUUID= method and I do have a working Yocto setup that uses PARTUUID to find the rootfs. It integrates nicely with the automatic disk/uuid creation and U-boot using extlinux.conf [1]. I do however understand that this requires major changes to the meta-sunxi layer and the maintainers don't like breaking a working system with U-boot scripts. So I went with the easier way of adding aliases. For future reference to anyone, this patch has now been added downstream to meta-sunxi [2].
[1] https://github.com/linux-sunxi/meta-sunxi/pull/431 [2] https://github.com/linux-sunxi/meta-sunxi/pull/432 On 02.01.25 00:28, Andre Przywara wrote:
Yes, and LABEL= would be another way. Alternatively you could use U-Boot's DT when booting the board. U-Boot will add those aliases during build time (because it needs them for its own purposes), and by using $fdtcontroladdr (instead of $fdt_addr_r, on the bootz command line) you get this for free, and even save yourself from loading some DT. We sync the DTs regularly from the kernel to U-Boot now, and at the moment they are identical between the kernel and U-Boot, so you don't lose anything.
Thanks Andre for the helpful tips. I'll remember this for future reference. Best, Stefan
