From: Simon Glass <sjg@chromium.org> Add a new helper which lists the subnodes of the reserved-memory node. This can be helpful when checking the devicetree before booting. Co-developed-by: Claude <noreply@anthropic.com> Signed-off-by: Simon Glass <sjg@chromium.org> --- boot/fdt_support.c | 54 +++++++++++++++++++++++++++++++++++++++++++ include/fdt_support.h | 7 ++++++ 2 files changed, 61 insertions(+) diff --git a/boot/fdt_support.c b/boot/fdt_support.c index 92f2f534ee0..f42eaa488de 100644 --- a/boot/fdt_support.c +++ b/boot/fdt_support.c @@ -2259,3 +2259,57 @@ int fdt_fixup_pmem_region(void *fdt, u64 pmem_start, u64 pmem_size) return 0; } + +void fdt_print_reserved(void *fdt) +{ + int node, reserved, id; + int addr_cells, size_cells; + + printf("%-4s %-20s %-18s %-18s\n", "ID", "Name", "Start", "Size"); + printf("--------------------------------------------------------" + "--------\n"); + + reserved = fdt_path_offset(fdt, "/reserved-memory"); + if (reserved < 0) { + printf("No /reserved-memory node found in device tree\n"); + return; + } + + /* Get #address-cells and #size-cells from reserved-memory node */ + fdt_support_default_count_cells(fdt, reserved, &addr_cells, + &size_cells); + + id = 0; + fdt_for_each_subnode(node, fdt, reserved) { + const char *name = fdt_get_name(fdt, node, NULL); + const fdt32_t *reg; + u64 rsv_start = 0, rsv_size = 0; + int len; + + reg = fdt_getprop(fdt, node, "reg", &len); + if (reg && len >= (addr_cells + size_cells) * sizeof(fdt32_t)) { + int cells = 0; + + /* Parse address */ + for (int i = 0; i < addr_cells; i++) + rsv_start = (rsv_start << 32) | + fdt32_to_cpu(reg[cells++]); + + /* Parse size */ + for (int i = 0; i < size_cells; i++) + rsv_size = (rsv_size << 32) | + fdt32_to_cpu(reg[cells++]); + + printf("%-4d %-20s 0x%-16llx 0x%-16llx\n", + id++, name ? name : "(unnamed)", rsv_start, + rsv_size); + } else { + printf("%-4d %-20s %-18s %-18s\n", + id++, name ? name : "(unnamed)", "(no reg)", + "(no reg)"); + } + } + + if (!id) + printf("No reserved-memory regions found\n"); +} diff --git a/include/fdt_support.h b/include/fdt_support.h index eca9e7e3ac3..abd7504ad9b 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -529,4 +529,11 @@ int fdt_print(const void *fdt, int nodeoffset, int depth); */ int fdt_print_path(const char *pathp, char *prop, int depth); +/** + * fdt_print_reserved() - Print all device tree reserved-memory nodes + * + * @fdt: Device tree blob + */ +void fdt_print_reserved(void *fdt); + #endif /* ifndef __FDT_SUPPORT_H */ -- 2.43.0