arch/x86: Link walkcbfs.S instead on including it in bootblock.S
The code flow doesn't fall through to walkcbfs, as it does in the rest
of bootblock.S. Instead, walkcbfs is called (albeit via a jmp). The
linker cannot know this when walkcbfs.S is included directly.
When we use a CAR bootblock, we lose several hundred bytes because
walkcbfs is not garbage-collected, yet it isn't used. This problem
is solved by assembling walkcbfs.S separately, and linking it.
Change-Id: Ib3a976db09b9ff270b7677cb4f9db80b0b025e22
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/11785
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/arch/x86/walkcbfs.S b/src/arch/x86/walkcbfs.S
index 9c26d3c9..ac2d134 100644
--- a/src/arch/x86/walkcbfs.S
+++ b/src/arch/x86/walkcbfs.S
@@ -18,6 +18,9 @@
#define CBFS_FILE_STRUCTSIZE (CBFS_FILE_OFFSET + 4)
+.section .text
+.global walkcbfs_asm
+
/*
* input %esi: filename
* input %esp: return address (not pointer to return address!)