On 12:32 Mon 03 Sep , Juergen Beisert wrote: > Hi all, > > currently I'm working on the difficult process to make an i.MX35 SoC boot from > an externally connected NAND device. > > Nothing special with it, only the NAND flash controller in the i.MX35 (also in > i.MX25, i.MX27 and i.MX31) is braindamaged broken. This controller loses the > factory bad block markers when used without a workaround and losing these > markers is a _really_ bad idea. > > But to use the workaround on these SoCs it needs a complicated preparation of > the NAND. Doing it manually is very error prone. And this kind of preparation > has to be kept when the system should be updated and so on. Not easy to > explain and so much more chances for the user to brick the system while the > update process. > > This makes me think about a dedicated command which is responsible to make the > target bootable and does all the (more or less complicated) steps to ensure > the next time it gets powered it's able to boot again. > > There are more architectures which needs a complicated setup to be able to > boot it from some kind of externally connected devices like NAND or eMMCs for > example. Some needs special NAND checksums only for the bootloader, others > needs to keep the partition table even if the bootloader gets updated and so > on. > > Would it be possible to share one command (or one group of commands) by all > architectures? And each architecture adds its special code to the command? > > What kind of setup procedures we must cover with such a command? > > My examples: > > - for the Freescale i.MX SoCs with the broken NFC we must write the bootloader > in a different way than all the remaining data into the NAND device > - for the Samsung S36410 we must save the factory bad block markers first to > support booting from NAND as its internal ROM expects the checksums at a > strange offset in the OOB area On some ST SoC it's the same I think we do not need any command we just need to specify it as mtd level for a specific mtd part Best Regards, J. _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
