[U-Boot] Getting started with uboot

[Wolfgang Denk]

Dear Thomas Heller,

In message <i3chbe$ta2$1 at dough.gmane.org> you wrote:
>
> And actually this is the problem: I put uboot into the RedBoot flash
> partition, which is only 0x40000 in size (256 kB), but uboot apparently
> needs much more.

Right - it needs two more flash blocks.

> Which raises the question: why is the environment so large?  Wouldn't a
> few kB be enough (4kB, 16kB for example)?

NAND flash cannot be erased in arbitray sizes, but only in blocks; on
the TX25 the erase block size is 128 kB. So with redundant environment
we need two block for the U-Boot code, and two more for the 2 copies
of the environment = a total of 512 KiB.

Best regards,

Wolfgang Denk

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