On Thu, 2007-12-13 at 15:43 -0800, Stephen Neuendorffer wrote:
> 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.
>
> Signed-off-by: Stephen Neuendorffer <[EMAIL PROTECTED]>
> ---
> arch/powerpc/boot/raw-platform.c | 22 ++++++++++++++++++++++
> 1 files changed, 22 insertions(+), 0 deletions(-)
This raw-platform.c file doesn't seem like a good place for code that is
totally platform specific ...
Ben.
> diff --git a/arch/powerpc/boot/raw-platform.c
> b/arch/powerpc/boot/raw-platform.c
> index b9caeee..2a5e493 100644
> --- a/arch/powerpc/boot/raw-platform.c
> +++ b/arch/powerpc/boot/raw-platform.c
> @@ -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;
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