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| author | Igor Opaniuk <igor.opaniuk@toradex.com> | 2019-12-03 14:04:46 +0200 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2019-12-06 12:09:25 +0100 |
| commit | 949b5a969d107613b61a1e5eaf9e43c75a97f42c (patch) | |
| tree | 80d8bf824579de0f032c64b4e908c146e68299db /common/fdt_support.c | |
| parent | 1fae23899c7d6a7f44dec6a963d6c74ce5fe5c19 (diff) | |
common: fdt_support: add support for setting usable memory
Add support for setting linux,usable-memory property in the memory
node of device tree for the kernel [1].
This property holds a base address and size, describing a
limited region in which memory may be considered available for use by
the kernel. Memory outside of this range is not available for use.
[1] https://www.kernel.org/doc/Documentation/devicetree/bindings/chosen.txt
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Diffstat (limited to 'common/fdt_support.c')
| -rw-r--r-- | common/fdt_support.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/common/fdt_support.c b/common/fdt_support.c index 6834399039..02cf5c6241 100644 --- a/common/fdt_support.c +++ b/common/fdt_support.c @@ -467,6 +467,41 @@ 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\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; +} #endif int fdt_fixup_memory(void *blob, u64 start, u64 size) |