firmware-utils: ptgen: add SiFive-related GUID types

Add patch until it gets accepted in firmware-utils upstream.

The SiFive RISC-V SoCs use two special partition types in the boot process.
As a first step, the ZSBL (zero-stage bootloader) in the CPU looks for a
partition with a GUID of 5B193300-FC78-40CD-8002-E86C45580B47 to load the
first-stage bootloader - which in OpenWrt's case is an SPL image. The FSBL
(SPL) then looks for a partition with a GUID of
2E54B353-1271-4842-806F-E436D6AF6985 to load the SSBL which is usually an
u-boot.

With ptgen already supporting GPT partition creation, add the required GUID
types and name them accordingly to be invoked with the '-T <GPT partition
type>' parameter.

Signed-off-by: Zoltan HERPAI <[email protected]>

tools/firmware-utils/patches/001-add-sifiveu-guid-types.patch

@@ -0,0 +1,38 @@
+diff -ruN firmware-utils-2022-02-28-002cfaf0.old/src/ptgen.c firmware-utils-2022-02-28-002cfaf0/src/ptgen.c
+--- firmware-utils-2022-02-28-002cfaf0.old/src/ptgen.c	2022-04-23 19:02:07.307896842 +0200
++++ firmware-utils-2022-02-28-002cfaf0/src/ptgen.c	2022-04-22 18:48:54.477970950 +0200
+@@ -82,6 +82,14 @@
+ 	GUID_INIT( 0x0fc63daf, 0x8483, 0x4772, \
+ 			0x8e, 0x79, 0x3d, 0x69, 0xd8, 0x47, 0x7d, 0xe4)
+ 
++#define GUID_PARTITION_SIFIVE_SPL \
++	GUID_INIT( 0x5b193300, 0xfc78, 0x40cd, \
++			0x80, 0x02, 0xe8, 0x6c, 0x45, 0x58, 0x0b, 0x47)
++
++#define GUID_PARTITION_SIFIVE_UBOOT \
++	GUID_INIT( 0x2e54b353, 0x1271, 0x4842, \
++			0x80, 0x6f, 0xe4, 0x36, 0xd6, 0xaf, 0x69, 0x85)
++
+ #define GPT_HEADER_SIZE         92
+ #define GPT_ENTRY_SIZE          128
+ #define GPT_ENTRY_MAX           128
+@@ -276,6 +284,19 @@
+ 			      (1ULL << 56);  /* success=1 */
+ 		return true;
+ 	}
++
++	if (!strcmp(type, "sifiveu_spl")) {
++		part->has_guid = true;
++		part->guid = GUID_PARTITION_SIFIVE_SPL;
++		return true;
++	}
++
++	if (!strcmp(type, "sifiveu_uboot")) {
++		part->has_guid = true;
++		part->guid = GUID_PARTITION_SIFIVE_UBOOT;
++		return true;
++	}
++
+ 	return false;
+ }
+