[U-Boot-Users] Re: U-boot environment in Xilinx System ACE?
wd at denx.de
Thu Jul 7 23:56:08 CEST 2005
in message <OF203F9449.99AEB2AF-ON07257037.006EF267-07257037.0071F9E5 at mck.us.ray.com> you wrote:
> I did remember that the u-boot environment was read very early and it
> sounds like the restricted runtime environment was the reason that
> storing then environment in compact flash was not implemented.
Right, this is the big problem.
> If the problem is RAM, then I can solve that by dedicating some
> internal RAM in the FPGA for stack and data. Could we also use
> the PPC405 caches?
It's not just having some memory, but all the other restrictions while
running from flash: no writable data segment, not initialized BSS.
Check the code where CFG_ENV_IS_NOWHERE is used; use a static confi-
guration for the console baudrate etc. This can get you started...
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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