When using "objcopy -O binary" to generate AArch64 EFI images, it
silently drops the sections without "alloc" or "load" or the sections
with "unload", and this caused the content of .sbat was skipped in the
final EFI image.
This commit sets the common read-only data section flags to .sbat to
make sure the content will be copied.
Signed-off-by: Gary Lin <glin@suse.com>
The current approach of adding SBAT metadata after linking is creating
an image that is badly formed in 2 ways:
* The SBAT section's file offset and size are not a multiple of the
file alignment.
* The SBAT section has a virtual address of zero. EDK2 loads the header
here, and so it gets rejected.
This changes the approach to match shim, where an object file is
created with a .sbat section and then the linker takes care of placing
the section at a more appropriate virtual address.
See https://github.com/vathpela/gnu-efi/pull/14 for the section addition.
