[U-Boot] Port to at91sam9g45-ekes

[U-Boot] Port to at91sam9g45-ekes

[Morten Kristiansen]

Hi U-boot members. I have ported u-boot to the AT91SAM9G45-EKES board. I
have, however, run into a little problem. The internal boot-ROM in the
SAM9G45 processor only accepts boot-loaders up to 60K and the loader I have
is already 70K. I therefore need an chainloader in between. Is there a
recommended approach for this, something like

1. Use some other smaller bootloader to boot u-boot.
2. Use a tiny version of u-boot to boot the real u-boot.
3. Use pieces u-boot, e.g. by replacing start_armboot


... or should I just use man fantasy? ;-)


Regards,

Morten Kristiansen

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[U-Boot] Port to at91sam9g45-ekes

[Reinhard Meyer]

Dear Morten Kristiansen,

> Hi U-boot members. I have ported u-boot to the AT91SAM9G45-EKES board. I
> have, however, run into a little problem. The internal boot-ROM in the
> SAM9G45 processor only accepts boot-loaders up to 60K and the loader I have
> is already 70K. I therefore need an chainloader in between. Is there a
> recommended approach for this, something like

You are likely to end near 200k...

>
> 1. Use some other smaller bootloader to boot u-boot.

That would usually be AT91BOOTSTRAP, which initializes SDRAM and loads software
from NAND, SPI, MMC etc.

> 2. Use a tiny version of u-boot to boot the real u-boot.

We don't have that (yet) for AT91.

> 3. Use pieces u-boot, e.g. by replacing start_armboot

Are you using current u-boot, like at least the released 2010.09 ?

Regards,
Reinhard