soc/amd/common/fsp: check fsp image revision

Check if FSP binary and coreboot FSP structures (fspmupd.h) match
sufficiently.

A change in minor number denotes less critical changes or additions
to the FSP API that still allow for the boot process to proceed.
A change of the AMD image revision major number will halt boot.
The Fspmupd.h header now defines IMAGE_REVISION_ macros for AMD
Picasso, Cezanne and Sabrina APUs.

BUG=b:184650244
TEST=build, boot and check fsp image revision info. Example:

FSP major    = 1
FSP minor    = 0
FSP revision = 5
FSP build    = 0

Signed-off-by: Julian Schroeder <julianmarcusschroeder@gmail.com>
Change-Id: I0fbf9413b0cf3e6093ee9c61ff692ff78ebefebc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61281
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 39 insertions, 2 deletions

diff --git a/src/soc/amd/common/fsp/fsp_validate.c b/src/soc/amd/common/fsp/fsp_validate.c
index 4d6a8f72bc45..d9ff5026b3e6 100644
--- a/src/soc/amd/common/fsp/fsp_validate.c
+++ b/src/soc/amd/common/fsp/fsp_validate.c
@@ -4,12 +4,49 @@
 #include <fsp/util.h>
 #include <types.h>
 
+struct amd_image_revision {
+	uint8_t build;
+	uint8_t revision;
+	uint8_t minor;
+	uint8_t major;
+} __packed;
+
 /* Validate the FSP-M header in romstage */
 void soc_validate_fspm_header(const struct fsp_header *hdr)
 {
+	struct amd_image_revision *rev;
+
+	rev = (struct amd_image_revision *) &(hdr->image_revision);
+
 	/* Check if the image fits into the reserved memory region */
 	if (hdr->image_size > CONFIG_FSP_M_SIZE)
-		die("The FSP-M binary is %u bytes larger than the memory region allocated for "
-			"it. Increase FSP_M_SIZE to make it fit.\n",
+		die("The FSP-M binary is %u bytes larger than the memory region"
+		" allocated for it. Increase FSP_M_SIZE to make it fit.\n",
 			hdr->image_size - CONFIG_FSP_M_SIZE);
+
+	/* a coding bug on the AMD FSP side makes this value 1 in
+	older versions of the FSP.*/
+	if (hdr->image_revision == 1) {
+		printk(BIOS_ERR, "No AMD FSP image revision information available\n");
+		return;
+	}
+
+	printk(BIOS_INFO, "FSP major    = %d\n", rev->major);
+	printk(BIOS_INFO, "FSP minor    = %d\n", rev->minor);
+	printk(BIOS_INFO, "FSP revision = %d\n", rev->revision);
+	printk(BIOS_INFO, "FSP build    = %d\n", rev->build);
+
+	if ((rev->major != IMAGE_REVISION_MAJOR_VERSION) ||
+	(rev->minor != IMAGE_REVISION_MINOR_VERSION)) {
+		printk(BIOS_WARNING, "FSP binary and SOC FSP header file don't match.\n");
+		printk(BIOS_WARNING, "include file ImageRevisionMajorVersion=%d\n",
+			IMAGE_REVISION_MAJOR_VERSION);
+		printk(BIOS_WARNING, "include file ImageRevisionMinorVersion=%d\n",
+			IMAGE_REVISION_MINOR_VERSION);
+		printk(BIOS_WARNING, "Please update FspmUpd.h based on the corresponding FSP"
+			" build's FspmUpd.h\n");
+	}
+
+	if (rev->major != IMAGE_REVISION_MAJOR_VERSION)
+		die("IMAGE_REVISION_MAJOR_VERSION mismatch, halting\nGoodbye now\n");
 }