efi: Make FDT extra space configurable

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@sii.pl>
Signed-off-by: Pawel Kochanowski <pkochanowski@sii.pl>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

diff --git a/lib/efi_loader/efi_dt_fixup.c b/lib/efi_loader/efi_dt_fixup.c
index 26928cf..544e1aa 100644 (file)
--- 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 8c32059..3936139 100644 (file)
--- a/lib/efi_loader/efi_helper.c
+++ b/lib/efi_loader/efi_helper.c
@@ -485,7 +485,7 @@ 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,