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multiboot: Refactor boot data validation, add version numbers

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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
This commit is contained in:
Aidan MacDonald 2022-12-22 19:23:29 +00:00
parent af644e02a1
commit 6ffd42548b
11 changed files with 150 additions and 59 deletions
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2
firmware/common/rb-loader.c
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@ -112,7 +112,7 @@ int load_firmware(unsigned char* buf, const char* firmware, int buffer_size)
{
ret = load_firmware_filename(buf, filename, buffer_size);
/* if firmware has no boot_data don't load from external drive */
if (write_bootdata(buf, ret, i) <= 0)
if (!write_bootdata(buf, ret, i))
ret = EKEY_NOT_FOUND;
}
/* if ret is valid breaks from loop to continue loading */