avr32: added mem kernel command line option support

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/avr32/kernel/setup.c b/arch/avr32/kernel/setup.c
index d8e623c426c..5c7083916c3 100644
--- a/arch/avr32/kernel/setup.c
+++ b/arch/avr32/kernel/setup.c
@@ -283,6 +283,25 @@ static int __init early_parse_fbmem(char *p)
 }
 early_param("fbmem", early_parse_fbmem);
 
+/*
+ * Pick out the memory size.  We look for mem=size@start,
+ * where start and size are "size[KkMmGg]"
+ */
+static int __init early_mem(char *p)
+{
+        resource_size_t size, start;
+
+        start = system_ram->start;
+        size  = memparse(p, &p);
+        if (*p == '@')
+                start = memparse(p + 1, &p);
+
+        system_ram->start = start;
+        system_ram->end = system_ram->start + size - 1;
+        return 0;
+}
+early_param("mem", early_mem);
+
 static int __init parse_tag_core(struct tag *tag)
 {
         if (tag->hdr.size > 2) {