Xilinx: clear data caches.
PATCH 1/1 Xilinx: clear data caches.
This code is needed to boot without a boot loader.
Grant: I'm not sure where the right place to put this is. I'm assuming we'll actually need some boot code that is not generic? Also, note that there is a V4FX errata workaround in arch/ppc/boot/head.S, which probably also needs to get pulled to powerpc.
--- arch/powerpc/boot/raw-platform.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)
arch/powerpc/boot/raw-platform.c +22 -0
@@ -24,6 +24,28 @@ void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7) {u64 memsize64 = memsize[0 ]; +static const unsigned long line_size =32 ; +static const unsigned long congruence_classes =256 ; +unsigned long addr; +unsigned long dccr; + +/* +* Invalidate the data cache if the data cache is turned off. +* - The 405 core does not invalidate the data cache on power-up +* or reset but does turn off the data cache. We cannot assume +* that the cache contents are valid. +* - If the data cache is turned on this must have been done by +* a bootloader and we assume that the cache contents are +* valid. +*/ + __asm__("mfdccr %0" :"=r" (dccr)); +if (dccr ==0 ) { +for (addr =0 ; + addr < (congruence_classes * line_size); + addr += line_size) { + __asm__("dccci 0,%0" : :"b" (addr)); + } + }if (mem_size_cells ==2 ) { memsize64 <<=32 ;
Signature · 1 line
1.5.3.4-dirty
Quoted 3 lines · Stephen Neuendorffer
This code is needed to boot without a boot loader.
Grant: I'm not sure where the right place to put this is. I'm assuming we'll actually need some boot code that is not generic? Also, note that there is a V4FX errata workaround in
arch/ppc/boot/head.S, which probably also needs to get pulled to powerpc.
Thanks Steve, I'll pull this into my tree. I hope to find some time to get the raw platform cleaned up to get into mainline.
And, yes, the V4FX errata needs to be merged into arch/powerpc.
Thanks again!
g.
Quoted 45 lines
Signed-off-by Stephen Neuendorffer <[email protected]>--- arch/powerpc/boot/raw-platform.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+), 0 deletions(-)arch/powerpc/boot/raw-platform.c +22
-1@@ -24,6 +24,28 @@ void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7) {u64 memsize64 = memsize[0 ]; +static const unsigned long line_size =32 ; +static const unsigned long congruence_classes =256 ; +unsigned long addr; +unsigned long dccr; + +/* +* Invalidate the data cache if the data cache is turned off. +* - The 405 core does not invalidate the data cache on power-up +* or reset but does turn off the data cache. We cannot assume +* that the cache contents are valid. +* - If the data cache is turned on this must have been done by +* a bootloader and we assume that the cache contents are +* valid. +*/ + __asm__("mfdccr %0" :"=r" (dccr)); +if (dccr ==0 ) { +for (addr =0 ; + addr < (congruence_classes * line_size); + addr += line_size) { + __asm__("dccci 0,%0" : :"b" (addr)); + } + }if (mem_size_cells ==2 ) { memsize64 <<=32 ; --1.5.3.4-dirty
Signature · 4 lines
Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. [email protected] (403) 399-0195