[PATCH v2] efi: Make FDT extra space configurable

[Pawel Kochanowski]

U-Boot currently reserves only 0x3000 bytes when copying the FDT
in copy_fdt(), which may not be sufficient if additional nodes
(such as FMAN firmware) are added later.

This patch uses the exisitng SYS_FDT_PAD to reserve space for FDT fixup
instead of hardcoded value.

This change prevents potential corruption when resizing FDT after
EFI boot, especially when firmware like FMAN requires additional
space.

Signed-off-by: Gabriel Nesteruk <gnesteruk at sii.pl>
Signed-off-by: Pawel Kochanowski <pkochanowski at sii.pl>
---
Changes since version 1:
- Removed custom CONFIG_FDT_EXTRA_SPACE in favor of already present SYS_FDT_PAD
- Use the define also in efi_dt_fixup.c

 lib/efi_loader/efi_dt_fixup.c | 2 +-
 lib/efi_loader/efi_helper.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/efi_loader/efi_dt_fixup.c b/lib/efi_loader/efi_dt_fixup.c
index 26928cfc454..544e1aa9808 100644
--- a/lib/efi_loader/efi_dt_fixup.c
+++ b/lib/efi_loader/efi_dt_fixup.c
@@ -168,7 +168,7 @@ efi_dt_fixup(struct efi_dt_fixup_protocol *this, void *dtb,
 		/* Check size */
 		required_size = fdt_off_dt_strings(dtb) +
 				fdt_size_dt_strings(dtb) +
-				0x3000;
+				CONFIG_SYS_FDT_PAD;
 		total_size = fdt_totalsize(dtb);
 		if (required_size < total_size)
 			required_size = total_size;
diff --git a/lib/efi_loader/efi_helper.c b/lib/efi_loader/efi_helper.c
index 04b2efc4a3b..40e5d31575a 100644
--- a/lib/efi_loader/efi_helper.c
+++ b/lib/efi_loader/efi_helper.c
@@ -477,7 +477,7 @@ static efi_status_t copy_fdt(void **fdtp)
 	 * needs to be expanded later.
 	 */
 	fdt = *fdtp;
-	fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
+	fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + CONFIG_SYS_FDT_PAD);
 	fdt_size = fdt_pages << EFI_PAGE_SHIFT;
 
 	ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
-- 
2.43.0