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efi: arm: Add the memory map to the FDT

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Before booting using extlinux we must add the memory map to the FDT.
Provide a ft_system_setup() function to handle this.

To determine the memory size, scan the memory map looking for entries
that look like real memory.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-08-11 17:55:46 -06:00
parent af34860c2d
commit 5cd3f28e09
2 changed files with 48 additions and 0 deletions
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1
configs/efi-arm_app64_defconfig
View File

@@ -14,6 +14,7 @@ CONFIG_EFI_RAM_SIZE=0x20000000
CONFIG_FIT=y
CONFIG_BOOTSTD_FULL=y
CONFIG_SHOW_BOOT_PROGRESS=y
CONFIG_OF_SYSTEM_SETUP=y
CONFIG_USE_BOOTARGS=y
CONFIG_BOOTCOMMAND="bootflow scan -lbp"
CONFIG_SYS_PBSIZE=532

47
lib/efi_client/efi_app.c
View File

@@ -287,6 +287,53 @@ int efi_app_exit_boot_services(struct efi_priv *priv, uint key)
return 0;
}
int ft_system_setup(void *fdt, struct bd_info *bd)
{
struct efi_mem_desc *map, *desc, *end;
u64 ram_start, ram_end;
int desc_size;
int ret, upto;
uint version;
int size;
uint key;
ret = efi_get_mmap(&map, &size, &key, &desc_size, &version);
if (ret)
return log_msg_ret("erm", ret);
efi_dump_mem_table(map, size, desc_size, false);
ram_start = -1ULL;
ram_end = -1ULL;
end = (void *)map + size;
for (upto = 0, desc = map; desc < end;
desc = efi_get_next_mem_desc(desc, desc_size), upto++) {
u64 base = desc->physical_start, limit;
if (!efi_mem_is_boot_services(desc->type) &&
desc->type != EFI_CONVENTIONAL_MEMORY)
continue;
if (ram_start == -1ULL)
ram_start = base;
limit = base + (desc->num_pages << EFI_PAGE_SHIFT);
log_debug("%d: %s: %llx limit %llx\n", upto,
efi_mem_type_name(desc->type), base, limit);
if (ram_end == -1ULL || limit > ram_end)
ram_end = limit;
}
log_info("RAM extends from %llx to %llx\n", ram_start, ram_end);
ret = fdt_fixup_memory(fdt, ram_start, ram_end - ram_start);
if (ret) {
printf("failed fixup memory\n");
return ret;
}
free(map);
return 0;
}
static const struct udevice_id efi_sysreset_ids[] = {
{ .compatible = "efi,reset" },
{ }