On Tue, Feb 17, 2026 at 08:51:34AM +0000, Antony Kurniawan Soemardi wrote: > 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]> > --- > arch/arm/mach-snapdragon/board.c | 5 +++++ > 1 file changed, 5 insertions(+) >
Reviewed-by: Sumit Garg <[email protected]> -Sumit > diff --git a/arch/arm/mach-snapdragon/board.c > b/arch/arm/mach-snapdragon/board.c > index > 5fb3240acc5a6dd23d93515029a596b5f77ebfa3..829a0109ac7807d692e127178f76d8822d5da5e2 > 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__); > > > --- > base-commit: f9ffeec4bdcf1da655a0ffea482062adde78fee8 > change-id: 20260215-qcom-fdt-overlay-ec6b8d9d2a1b > > Best regards, > -- > Antony Kurniawan Soemardi <[email protected]> >
