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authorEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>2017-08-15 21:13:54 +0300
committerVineet Gupta <vgupta@synopsys.com>2017-09-01 11:26:27 -0700
commit9ed68785f7f2b001a6911d64fbd10cfc6fa49b27 (patch)
tree57bf1ba37285d0a090eb52d24f15115f58d64e4f /arch/arc/mm/init.c
parentARCv2: IOC: Tighten up the contraints (specifically base / size alignment) (diff)
downloadlinux-dev-9ed68785f7f2b001a6911d64fbd10cfc6fa49b27.tar.xz
linux-dev-9ed68785f7f2b001a6911d64fbd10cfc6fa49b27.zip
ARC: mm: Decouple RAM base address from kernel link address
[Needed for HSDK] Currently the first page of system (hence RAM base) is assumed to be @ CONFIG_LINUX_LINK_BASE, where kernel itself is linked. However is case of HSDK platform, for reasons explained in that patch, this is not true. kernel needs to be linked @ 0x9000_0000 while DDR is still wired at 0x8000_0000. To properly account for this 256M of RAM, we need to introduce a new option and base page frame accountiing off of it. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> [vgupta: renamed CONFIG_KERNEL_RAM_BASE_ADDRESS => CONFIG_LINUX_RAM_BASE : simplified changelog]
Diffstat (limited to '')
-rw-r--r--arch/arc/mm/init.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 8c9415ed6280..ba145065c579 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -26,7 +26,7 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
EXPORT_SYMBOL(empty_zero_page);
-static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE;
+static const unsigned long low_mem_start = CONFIG_LINUX_RAM_BASE;
static unsigned long low_mem_sz;
#ifdef CONFIG_HIGHMEM
@@ -63,7 +63,7 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
if (!low_mem_sz) {
if (base != low_mem_start)
- panic("CONFIG_LINUX_LINK_BASE != DT memory { }");
+ panic("CONFIG_LINUX_RAM_BASE != DT memory { }");
low_mem_sz = size;
in_use = 1;
@@ -161,7 +161,7 @@ void __init setup_arch_memory(void)
* We can't use the helper free_area_init(zones[]) because it uses
* PAGE_OFFSET to compute the @min_low_pfn which would be wrong
* when our kernel doesn't start at PAGE_OFFSET, i.e.
- * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
+ * PAGE_OFFSET != CONFIG_LINUX_RAM_BASE
*/
free_area_init_node(0, /* node-id */
zones_size, /* num pages per zone */