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m68knommu: disable cache early in startup for ColdFire

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Disbale the CPU cache really early in the ColdFire startup code. We set
up some variables for RAM sizing and we want to make they stick in RAM.

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
2011-11-15 15:26:28 +10:00
parent 84f3fb7a2a
commit ec84118795
1 changed files with 3 additions and 3 deletions
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6
arch/m68k/platform/coldfire/head.S
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@@ -143,6 +143,9 @@ __HEAD
_start:
nop /* filler */
movew #0x2700, %sr /* no interrupts */
movel #CACHE_INIT,%d0 /* disable cache */
movec %d0,%CACR
nop
#if defined(CONFIG_UBOOT)
movel %sp,_init_sp /* save initial stack pointer */
#endif
@@ -176,9 +179,6 @@ _start:
* it is very similar. Define the exact settings in the headers
* then the code here is the same for all.
*/
movel #CACHE_INIT,%d0 /* invalidate whole cache */
movec %d0,%CACR
nop
movel #ACR0_MODE,%d0 /* set RAM region for caching */
movec %d0,%ACR0
movel #ACR1_MODE,%d0 /* anything else to cache? */