Check revision and reserved byte on UEFI PI Firmware volumes.

src/binwalk/magic/efi

 # http://blogs.phoenix.com/phoenix_technologies_bios/\
 # 2007/02/uefi_pi_10_firm.html
 
-40      string     _FVH
->32     ulequad    <0xFFFFFFFF       UEFI PI Firmware Volume
->>32    ulequad    x                 \b, volume size: %d
->>52    uleshort   x                 \b, header size: %d
+40      string     _FVH              UEFI PI Firmware Volume
+>32     ulequad    >0xFFFFFFFF       {invalid} unrealistic size
+>32     ulequad    x                 \b, volume size: %d
+>52     uleshort   x                 \b, header size: %d
+>58     ubyte      !0                {invalid} reserved byte set
+>59     ubyte      >1                {invalid} invalid revision
+>59     ubyte      x                 \b, revision: %d
 
 # GUID: 7A9354D9-0468-444A-81CE-0BF617D890D
->>16    string     \xd9\x54\x93\x7a\x68\x04\x4a\x44\x81\xce\x0b\xf6\x17\xd8\x90\xdf  \b, EFI Firmware File System
+>16     string     \xd9\x54\x93\x7a\x68\x04\x4a\x44\x81\xce\x0b\xf6\x17\xd8\x90\xdf  \b, EFI Firmware File System
 
 # GUID: 8C8CE578-8A3D-4F1C-9935-896185C32DD3
->>16    string     \x78\xe5\x8c\x8c\x3d\x8a\x1c\x4f\x99\x35\x89\x61\x85\xc3\x2d\xd3  \b, EFI Firmware File System v2
+>16     string     \x78\xe5\x8c\x8c\x3d\x8a\x1c\x4f\x99\x35\x89\x61\x85\xc3\x2d\xd3  \b, EFI Firmware File System v2
 
 # GUID: 04ADEEAD-61FF-4D31-B6BA-64F8BF901F5A
->>16    string     \xad\xee\xad\x04\xff\x61\x31\x4d\xb6\xba\x64\xf8\xbf\x90\x1f\x5a  \b, Apple Boot Volume
+>16     string     \xad\xee\xad\x04\xff\x61\x31\x4d\xb6\xba\x64\xf8\xbf\x90\x1f\x5a  \b, Apple Boot Volume
 
 # GUID: 8C1B00BD-716A-7B48-A14F-0C2A2DCF7A5D
->>16    string     \x8c\x1b\x00\xbd\x71\x6a\x7b\x48\xa1\x4f\x0c\x2a\x2d\xcf\x7a\x5d  \b, Apple Boot Volume v2
+>16     string     \x8c\x1b\x00\xbd\x71\x6a\x7b\x48\xa1\x4f\x0c\x2a\x2d\xcf\x7a\x5d  \b, Apple Boot Volume v2
 
 # GUID: AD3FFFFF-D28B-44C4-9F13-9EA98A97F9F0
->>16    string     \xff\xff\x3f\xad\x8b\xd2\xc4\x44\x9f\x13\x9e\xa9\x8a\x97\xf9\xf0  \b, Intel v1
+>16     string     \xff\xff\x3f\xad\x8b\xd2\xc4\x44\x9f\x13\x9e\xa9\x8a\x97\xf9\xf0  \b, Intel v1
 
 # GUID: D6A1CD70-4B33-4994-A6EA-375F2CCC5437
->>16    string     \x70\xcd\xa1\xd6\x33\x4b\x94\x49\xa6\xea\x37\x5f\x2c\xcc\x54\x37  \b, Intel v2
+>16     string     \x70\xcd\xa1\xd6\x33\x4b\x94\x49\xa6\xea\x37\x5f\x2c\xcc\x54\x37  \b, Intel v2
 
 # GUID: 4F494156-AED6-4D64-A537-B8A5557BCEEC
->>16    string     \x56\x41\x49\x4f\xd6\xae\x64\x4d\xa5\x37\xb8\xa5\x55\x7b\xce\xec  \b, Sony v1
+>16     string     \x56\x41\x49\x4f\xd6\xae\x64\x4d\xa5\x37\xb8\xa5\x55\x7b\xce\xec  \b, Sony v1
 
->>16    ulelong    x                 \b, GUID: %.8X-
->>>20   uleshort   x                 \b%.4X-
->>>22   uleshort   x                 \b%.4X-
->>>24   uleshort   x                 \b%.4X-
->>>26   ubyte      x                 \b%.2X
->>>27   ubyte      x                 \b%.2X
->>>28   ubyte      x                 \b%.2X
->>>29   ubyte      x                 \b%.2X
->>>30   ubyte      x                 \b%.2X
->>>31   ubyte      x                 \b%.2X
+>16     ulelong    x                 \b, GUID: %.8X-
+>>20    uleshort   x                 \b%.4X-
+>>22    uleshort   x                 \b%.4X-
+>>24    uleshort   x                 \b%.4X-
+>>26    ubyte      x                 \b%.2X
+>>27    ubyte      x                 \b%.2X
+>>28    ubyte      x                 \b%.2X
+>>29    ubyte      x                 \b%.2X
+>>30    ubyte      x                 \b%.2X
+>>31    ubyte      x                 \b%.2X
 
 # http://www.intel.com/content/www/us/en/architecture-and-technology/\
 # unified-extensible-firmware-interface/efi-capsule-specification.html