diff options
author | Andre Przywara <osp@andrep.de> | 2015-06-20 23:29:54 (GMT) |
---|---|---|
committer | Simon Glass <sjg@chromium.org> | 2015-07-20 13:21:47 (GMT) |
commit | 5c1cf89f8c342c8533f730409f7dd2b21806c3d3 (patch) | |
tree | 4d64366bf88e48696396ee1bf896564e2140d7a0 /include | |
parent | 605e15db2b54302364a2528d3c6604fbc57be846 (diff) | |
download | u-boot-5c1cf89f8c342c8533f730409f7dd2b21806c3d3.tar.xz |
fdt: prevent clearing memory node if there are no banks
Avoid clearing the reg property in the memory DT node if no memory
banks have been specified for a board (CONFIG_NR_DRAM_BANKS == 0).
This allows boards to let U-Boot skip the DT memory tinkering in case
other firmware has already setup the node properly before.
This should be safe as all callers of fdt_fixup_memory_banks that use
a computed <banks> value put at least 1 in there.
Add some documentation comments to the header file.
Signed-off-by: Andre Przywara <osp@andrep.de>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/fdt_support.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/fdt_support.h b/include/fdt_support.h index 0edc4fa..296add0 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -67,8 +67,34 @@ void do_fixup_by_compat(void *fdt, const char *compat, const char *prop, const void *val, int len, int create); void do_fixup_by_compat_u32(void *fdt, const char *compat, const char *prop, u32 val, int create); +/** + * Setup the memory node in the DT. Creates one if none was existing before. + * Calls fdt_fixup_memory_banks() to populate a single reg pair covering the + * whole memory. + * + * @param blob FDT blob to update + * @param start Begin of DRAM mapping in physical memory + * @param size Size of the single memory bank + * @return 0 if ok, or -1 or -FDT_ERR_... on error + */ int fdt_fixup_memory(void *blob, u64 start, u64 size); + +/** + * Fill the DT memory node with multiple memory banks. + * Creates the node if none was existing before. + * If banks is 0, it will not touch the existing reg property. This allows + * boards to not mess with the existing DT setup, which may have been + * filled in properly before. + * + * @param blob FDT blob to update + * @param start Array of size <banks> to hold the start addresses. + * @param size Array of size <banks> to hold the size of each region. + * @param banks Number of memory banks to create. If 0, the reg + * property will be left untouched. + * @return 0 if ok, or -1 or -FDT_ERR_... on error + */ int fdt_fixup_memory_banks(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); |