diff options
Diffstat (limited to 'target/linux/ramips/patches-3.8/0037-MIPS-add-detect_memory_region.patch')
| -rw-r--r-- | target/linux/ramips/patches-3.8/0037-MIPS-add-detect_memory_region.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.8/0037-MIPS-add-detect_memory_region.patch b/target/linux/ramips/patches-3.8/0037-MIPS-add-detect_memory_region.patch new file mode 100644 index 0000000000..2f5626efd0 --- /dev/null +++ b/target/linux/ramips/patches-3.8/0037-MIPS-add-detect_memory_region.patch @@ -0,0 +1,68 @@ +From 3350a0d29bc3f3d15b50835a20ffcc14a458e2d9 Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Sat, 13 Apr 2013 13:15:47 +0200 +Subject: [PATCH 37/79] MIPS: add detect_memory_region() + +Add a generic way of detecting the available RAM. This function is based on the +implementation already used by ath79. + +Signed-off-by: John Crispin <blogic@openwrt.org> +Patchwork: http://patchwork.linux-mips.org/patch/5178/ +--- + arch/mips/include/asm/bootinfo.h | 1 + + arch/mips/kernel/setup.c | 20 ++++++++++++++++++++ + 2 files changed, 21 insertions(+) + +diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h +index 7a51d87..6d6cfac 100644 +--- a/arch/mips/include/asm/bootinfo.h ++++ b/arch/mips/include/asm/bootinfo.h +@@ -104,6 +104,7 @@ struct boot_mem_map { + extern struct boot_mem_map boot_mem_map; + + extern void add_memory_region(phys_t start, phys_t size, long type); ++extern void detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max); + + extern void prom_init(void); + extern void prom_free_prom_memory(void); +diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c +index 8c41187..3937630 100644 +--- a/arch/mips/kernel/setup.c ++++ b/arch/mips/kernel/setup.c +@@ -23,6 +23,7 @@ + #include <linux/pfn.h> + #include <linux/debugfs.h> + #include <linux/kexec.h> ++#include <linux/sizes.h> + + #include <asm/addrspace.h> + #include <asm/bootinfo.h> +@@ -122,6 +123,25 @@ void __init add_memory_region(phys_t start, phys_t size, long type) + boot_mem_map.nr_map++; + } + ++void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max) ++{ ++ phys_t size; ++ ++ for (size = sz_min; size < sz_max; size <<= 1) { ++ if (!memcmp(detect_memory_region, ++ detect_memory_region + size, 1024)) ++ break; ++ } ++ ++ pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", ++ ((unsigned long long) size) / SZ_1M, ++ (unsigned long long) start, ++ ((unsigned long long) sz_min) / SZ_1M, ++ ((unsigned long long) sz_max) / SZ_1M); ++ ++ add_memory_region(start, size, BOOT_MEM_RAM); ++} ++ + static void __init print_memory_map(void) + { + int i; +-- +1.7.10.4 + |