[U-Boot-Users] decoding 'program check exception trap'
Wolfgang Denk
wd at denx.de
Tue Aug 17 13:43:15 CEST 2004
In message <877aabc404081704266d856f38 at mail.gmail.com> you wrote:
>
> > This is no problem at all. There are even boards without any flash at
> > all (for example, the PN62 board has no flash, and the U-Boot image
> > gets loaded into RAM over PCI).
>
> Hey WD, can you explain a bit on how you actually did this? The
> preboot command copies something from PCI. How / when do you write to
> the SDRAM over PCI? Did you do this through interrupts? Or was it
> something else?
In our case this was different. The system is a standard PCI card
which sits in a PC. Some software on the PC will initialize the card,
holding the processor in reset. It will then upload the U-Boot image
into SDRAM, and then release the processor on the card which will
boot U-Boot from the location in RAM, which then in turn will load
and boot Linux.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
Quote from the Boss... "I didn't say it was your fault. I said I was
going to blame it on you."
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