multiboot: Refactor boot data validation, add version numbers

Instead of verifying the CRC before every access of the boot data,
verify the CRC once at startup and set a flag to indicate the boot
data is valid.

Also add a framework to support multiple boot protocol versions.
Firmware declares the maximum supported protocol version using a
version byte in the boot data header. The bootloader chooses the
highest version supported by it and the firmware when deciding
what boot protocol to use.

Change-Id: I810194625dc0833f026d2a23b8d64ed467fa6aca

1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/export/multiboot.h b/firmware/export/multiboot.h
index 0132b8531f..4174e71d61 100644
--- a/firmware/export/multiboot.h
+++ b/firmware/export/multiboot.h
@@ -21,7 +21,7 @@
 #ifndef __MULTIBOOT_H__
 #define __MULTIBOOT_H__
 
-extern int write_bootdata(unsigned char* buf, int len, unsigned int boot_volume);
+extern bool write_bootdata(unsigned char* buf, int len, unsigned int boot_volume);
 #ifdef HAVE_MULTIBOOT
 extern int get_redirect_dir(char* buf, int buffer_size, int volume,
                             const char* rootdir, const char* firmware);