Hello Benedikt,
Am Fri, Oct 18, 2024 at 04:19:08PM +0200 schrieb Benedikt Spranger:
On Fri, 18 Oct 2024 15:11:20 +0200 Alexander Dahl ada@thorsis.com wrote:
Hello Alexander,
Am Fri, Oct 18, 2024 at 10:30:00AM +0200 schrieb Benedikt Spranger:
OK, you might say the nand_atmel NAND driver is obsolete, but it was the only solution to get booting from NAND running. The new DM based NAND driver refused to do anything usefull, so I dropped it after spending a couple of days debugging it:
Strange. I have at least three different boards with SAMA5D27 successfully booting from NAND flash with the new DM based driver (unfortunately none of them upstreamed, which also won't change in the foreseeable future, sorry).
OK.
Do you use at91bootstrap as 2nd level bootloader like me or something else?
I use the U-Boot SPL. There is no UBI support in at91boostrap. There were some attemps, but... No interest at the at91bootstrap side.
Yeah, been there. Wanted at91bootstrap to boot from SPI-NOR which is _not_ Quad-SPI, and the feature request was closed with "if you wanna do it by yourself, ask our support for help". :-/
For me it was basically getting the dts for U-Boot correct, but I got that running with all U-Boot releases since 2023.04 up to 2024.10. Could you share some more detail?
I face all the trouble in SPL. And since the SPL is the essential part here (UBI support) I gave up at one point. I simply couldn't any usefull read data from the NAND flash, but all 0.
You can not store bootstrap or SPL in UBI, it must sit in first sector of raw NAND, I suppose that's how you load SPL? Did you try reading/writing raw NAND from there? I'm not familiar with SPL, does it consider dts? I could share my dts parts if that helps you.
(What I do here: SoC loads at91bootstrap from raw NAND at offset 0, at91bootstrap loads U-Boot from raw NAND at some offset like 0x20000, U-Boot (proper) loads everything else from UBI.)
Greets Alex