* PPCBoot and IMMR remapping for linux 2.4 on sbc8260
@ 2001-09-20 21:29 Craig MacDonald
2001-09-20 22:41 ` Dan Malek
2001-09-23 18:00 ` Wolfgang Denk
0 siblings, 2 replies; 3+ messages in thread
From: Craig MacDonald @ 2001-09-20 21:29 UTC (permalink / raw)
To: linuxppc-embedded
The immr_base value in PPCBoot on my sbc8260 is
0x0f000000. I have been reading here that the
best value for linux is 0xf0000000.
I don't have easy access to flash my PPCBoot
to a new immr_base value, but I want to run
linux. I have been trying to change the immr_base
in assembly, but it does not seem to work.
Can I setup linux correctly using this method.
.set IMMR_H, 0x0f01
.set IMMR_L, 0x01a8
lis r4,IMMR_H
ori r4,r4,0x0000
lwz r4,IMMR_L(r4) // get the current value of the IMMR
lis r5,0xfff8
ori r5,r5,0xffff // Zero out the ISB field
and. r4,r4,r5
lis r5,0x0004 // Change the IMMR reg to be at 0xf0000000
or. r5,r4,r5
lis r4,IMMR_H
ori r4,r4,0x0000
stw r5,IMMR_L(r4) // modify the immr register
Best,
Craig MacDonald
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PPCBoot and IMMR remapping for linux 2.4 on sbc8260
2001-09-20 21:29 PPCBoot and IMMR remapping for linux 2.4 on sbc8260 Craig MacDonald
@ 2001-09-20 22:41 ` Dan Malek
2001-09-23 18:00 ` Wolfgang Denk
1 sibling, 0 replies; 3+ messages in thread
From: Dan Malek @ 2001-09-20 22:41 UTC (permalink / raw)
To: Craig MacDonald; +Cc: linuxppc-embedded
Craig MacDonald wrote:
> .....I have been trying to change the immr_base
> in assembly, but it does not seem to work.
If the boot rom hasn't changed the default address (which they
sometimes do but don't tell you :-), just to this:
lis r5, 0x0f01
lis r4, 0xf000
stw r4, 0x1a8(r5)
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: PPCBoot and IMMR remapping for linux 2.4 on sbc8260
2001-09-20 21:29 PPCBoot and IMMR remapping for linux 2.4 on sbc8260 Craig MacDonald
2001-09-20 22:41 ` Dan Malek
@ 2001-09-23 18:00 ` Wolfgang Denk
1 sibling, 0 replies; 3+ messages in thread
From: Wolfgang Denk @ 2001-09-23 18:00 UTC (permalink / raw)
To: Craig MacDonald; +Cc: linuxppc-embedded
Dear Craig,
in message <4E48AD2F.671BD424.031B03A1@netscape.net> you wrote:
>
> The immr_base value in PPCBoot on my sbc8260 is
> 0x0f000000. I have been reading here that the
> best value for linux is 0xf0000000.
THis is your own bug, then. The default configuration of PPCBoot for
the SBC8260 uses this definition in "include/config_sbc8260.h":
#define CFG_IMMR 0xf0000000
> I don't have easy access to flash my PPCBoot
> to a new immr_base value, but I want to run
Where exactly is the problem? It is a trivial job to use any running
version of PPCBoot to upgrade to a new version (just using
"tftp", "protect off", "erase" and "cp.b" commands).
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
While most peoples' opinions change, the conviction of their correct-
ness never does.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2001-09-20 21:29 PPCBoot and IMMR remapping for linux 2.4 on sbc8260 Craig MacDonald
2001-09-20 22:41 ` Dan Malek
2001-09-23 18:00 ` Wolfgang Denk
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