diff options
author | Sanchayan Maity <maitysanchayan@gmail.com> | 2016-10-19 17:36:21 +0530 |
---|---|---|
committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-02-01 15:14:58 +0100 |
commit | 6fe5177a1ab17fa971ac6c914676aa15c6402bcc (patch) | |
tree | 9df48896badfe336a28dcc7bbd9dcb940c5270bd | |
parent | cf47f0af36b07883f92b22a00add2ac06c520a03 (diff) |
common: fdt_support: Add support for setting usable memory
Add support for setting the linux,usable-memory in the memory
node of device tree.
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
-rw-r--r-- | common/fdt_support.c | 36 | ||||
-rw-r--r-- | include/fdt_support.h | 1 |
2 files changed, 37 insertions, 0 deletions
diff --git a/common/fdt_support.c b/common/fdt_support.c index 8266bca7d6..a8f3540862 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -440,6 +440,42 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks) return 0; } +int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int areas) +{ + int err, nodeoffset; + int len; + u8 tmp[8 * 16]; /* Up to 64-bit address + 64-bit size */ + + if (areas > 8) { + printf("%s: num areas %d exceeds hardcoded limit %d." + " Recompile with higher MEMORY_BANKS_MAX?\n", + __func__, areas, 8); + return -1; + } + + err = fdt_check_header(blob); + if (err < 0) { + printf("%s: %s\n", __func__, fdt_strerror(err)); + return err; + } + + /* find or create "/memory" node. */ + nodeoffset = fdt_find_or_add_subnode(blob, 0, "memory"); + if (nodeoffset < 0) + return nodeoffset; + + len = fdt_pack_reg(blob, tmp, start, size, areas); + + err = fdt_setprop(blob, nodeoffset, "linux,usable-memory", tmp, len); + if (err < 0) { + printf("WARNING: could not set %s %s.\n", + "reg", fdt_strerror(err)); + return err; + } + + return 0; +} + int fdt_fixup_memory(void *blob, u64 start, u64 size) { return fdt_fixup_memory_banks(blob, &start, &size, 1); diff --git a/include/fdt_support.h b/include/fdt_support.h index ae5e8a3ef6..beacb847f4 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -42,6 +42,7 @@ void do_fixup_by_compat_u32(void *fdt, const char *compat, const char *prop, u32 val, int create); int fdt_fixup_memory(void *blob, u64 start, u64 size); int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks); +int fdt_set_usable_memory(void *blob, u64 start[], u64 size[], int banks); void fdt_fixup_ethernet(void *fdt); int fdt_find_and_setprop(void *fdt, const char *node, const char *prop, const void *val, int len, int create); |