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m68knommu: hard set the ColdFire MBAR register on startup

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The ColdFire MBAR register that holds the mapping of the peripheral region
on some ColdFire CPUs is configurable. It can be configured at some address
different to that of the bootloader that loaded the kernel. So hard set
the MBAR register mapping at kernel startup time.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2011-11-23 14:46:36 +10:00
parent 192cfd5877
commit 10cb54de2c
1 changed files with 4 additions and 0 deletions
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4
arch/m68k/platform/coldfire/head.S
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@ -158,6 +158,10 @@ _start:
#if defined(CONFIG_UBOOT) #if defined(CONFIG_UBOOT)
movel %sp,_init_sp /* save initial stack pointer */ movel %sp,_init_sp /* save initial stack pointer */
#endif #endif
#ifdef CONFIG_MBAR
movel #CONFIG_MBAR+1,%d0 /* configured MBAR address */
movec %d0,%MBAR /* set it */
#endif
/* /*
* Do any platform or board specific setup now. Most boards * Do any platform or board specific setup now. Most boards