From 2d9f26b69377b3a5953d4422724069d9456c2684 Mon Sep 17 00:00:00 2001 From: York Sun Date: Fri, 14 Dec 2012 06:21:58 +0000 Subject: [PATCH] powerpc/mpc85xx: Reserve default boot page The boot page in memory is already reserved so OS won't overwrite. As long as the boot page translation is active, the default boot page also needs to be reserved in case the memory is 4GB or more. Signed-off-by: York Sun Signed-off-by: Andy Fleming --- arch/powerpc/cpu/mpc85xx/fdt.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c index ab09330..16d7f6a 100644 --- a/arch/powerpc/cpu/mpc85xx/fdt.c +++ b/arch/powerpc/cpu/mpc85xx/fdt.c @@ -100,6 +100,22 @@ void ft_fixup_cpu(void *blob, u64 memory_limit) printf("Failed to reserve memory for bootpg: %s\n", fdt_strerror(off)); } + +#ifndef CONFIG_MPC8xxx_DISABLE_BPTR + /* + * Reserve the default boot page so OSes dont use it. + * The default boot page is always mapped to bootpg above using + * boot page translation. + */ + if (0xfffff000ull < memory_limit) { + off = fdt_add_mem_rsv(blob, 0xfffff000ull, (u64)4096); + if (off < 0) { + printf("Failed to reserve memory for 0xfffff000: %s\n", + fdt_strerror(off)); + } + } +#endif + /* Reserve spin table page */ if (spin_tbl_addr < memory_limit) { off = fdt_add_mem_rsv(blob, -- 2.7.4