diff options
| author | Sanchayan Maity <maitysanchayan@gmail.com> | 2016-10-19 17:36:21 +0530 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-01-11 21:25:10 +0100 |
| commit | 863ab5b03106c80a4565b09f2fcc0628adea8747 (patch) | |
| tree | 43fa833ac02094c9e0d674955106f755d48b2594 | |
| parent | 3f2a490fb1765c9345d2cfb980dfe26f0b178d6e (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>
| -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 0609470dfb..2ef812bfa6 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -460,6 +460,42 @@ 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 506bc5a9f6..57bfbeb668 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -95,6 +95,7 @@ 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); |