RE: PPCBoot memory mapping problems

-----Original Message-----
From: owner-linuxppc-embedded@lists.linuxppc.org
[mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf Of
clark@esteem.com
Sent: Friday, August 18, 2000 9:49 PM
To: linuxppc-embedded@lists.linuxppc.org
Subject: PPCBoot memory mapping problems

...

        Our board boots up checks the kernels CRC then uncompresses it. It
then jumps to 0x0000000C. A little bit later it then jumps to some address
0xC000???? and faults.

        Is this what it is supposed to do? Am I supossed to have the RAM

Jump to 0xC000????  Yup.  Fault?  No.

mapped at 0xC0000000? If it loads at address 0 how do I remap it to
0xC0000000 once the kernel starts? Is there any way to force the kernel to

Basically, the kernel boot process should be doing this *for* you.

Part of the kernel boot process is to set up a memory mapping from
virtual C0000000 to physical 00000000, and then enable address translation.
This is done in arch/ppc/kernel/head.S using the BAT registers.

run in lower memory?

I doubt it.  It shouldn't be necessary, tho.

        Thanks in advance for any help.

        Conn Clark

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