[U-Boot-Users] Need help booting linux on 8265 eval board
wd at denx.de
Mon Apr 19 12:25:55 CEST 2004
In message <BAY2-F118ipEC1GEuqu00001cde at hotmail.com> you wrote:
> thanks for your reply. I think i should describe the problem clearly.
> First i explain why i modified the uboot/linux default values. I'm a
> graduate student. the board is designed by my schoolfellow(the board use
> 8265,but it is very like the board MPC8266ADS-PCI-AI), but this board is
> not supported by uboot, I must modify the configuration of sdram,IMMR and
> some other registers(from motorola datasheet). now the uboot looks running
> well(it can read/write flash/sdram, scc and fcc is also working), but when
> i boot the linux kernel, i meet the problem. i think i must let
> imap_addr(linux kernel)=IMMR(uboot), so I modify some default values.
Correct. But when you change somethiung, you better understand what
you change, and why, and how.
You must not try mapping the IMMR at such a low address. See
for some description about the Linux kernel's memory map.
> Now I want to know why linux mapped at 0xC0000000 , the uboot say "##
> Transferring control to Linux (at address 00000000) ...", so KERNELLOAD
> should be 0xc0000000 or 0x00000000?
Don;t even think of changing KERNELLOAD or things like that unless
you really understand what's going on. Both 0x00000000 and 0xc0000000
are correct addresses - one being a physical one, the other a
> and if I use linux kernel 2.4.20, CONFIG_CLOCKS_IN_MHZ should be 0 or
Neither 0 nor 1. It must be undefined.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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