diff options
| author | Antony Kurniawan Soemardi <[email protected]> | 2026-02-17 08:51:34 +0000 |
|---|---|---|
| committer | Casey Connolly <[email protected]> | 2026-04-27 12:33:30 +0200 |
| commit | 0bbde64361d96000ff4f4ff20d060745064f2b98 (patch) | |
| tree | fa55b712dfe6b30f39c7942f513b577b063cc75b | |
| parent | ca080b83a41fbc873ed5e7ed3ea674ee0a4b886a (diff) | |
mach-snapdragon: allocate memory for DT overlays
Allocate a 1 MiB LMB region for fdtoverlay_addr_r when
CONFIG_OF_LIBFDT_OVERLAY is enabled, allowing runtime application of
DT overlays on Snapdragon platforms.
This is useful for Android-based boot flows where the final DT passed
to the kernel must contain modified /firmware/android/fstab entries.
One use case is redirecting system and vendor partitions to microSD
storage instead of internal eMMC without rebuilding the base DTB.
The allocation is conditional on CONFIG_OF_LIBFDT_OVERLAY and has no
effect on boards that do not enable overlay support.
Signed-off-by: Antony Kurniawan Soemardi <[email protected]>
Reviewed-by: Sumit Garg <[email protected]>
Reviewed-by: Casey Connolly <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Casey Connolly <[email protected]>
| -rw-r--r-- | arch/arm/mach-snapdragon/board.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/mach-snapdragon/board.c b/arch/arm/mach-snapdragon/board.c index 5fb3240acc5..829a0109ac7 100644 --- a/arch/arm/mach-snapdragon/board.c +++ b/arch/arm/mach-snapdragon/board.c @@ -555,6 +555,11 @@ int board_late_init(void) fdt_status |= !lmb_alloc(SZ_2M, &addr) ? env_set_hex("fdt_addr_r", addr) : 1; + if (IS_ENABLED(CONFIG_OF_LIBFDT_OVERLAY)) { + status |= !lmb_alloc(SZ_1M, &addr) ? + env_set_hex("fdtoverlay_addr_r", addr) : 1; + } + if (status || fdt_status) log_warning("%s: Failed to set run time variables\n", __func__); |