[RFT/RFC][PATCH] optee-ftpm-stm32mp15x: Add patch to fix parallel build issues

[Jan Kiszka <jan.kiszka@siemens.com>]

From: Jan Kiszka <jan.kiszka@siemens.com>

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

Uladzimir, could you check if that helps in CI? I would then check if we 
can also bring it upstream (though upstream looks... complicated).

 .../0001-Fix-parallel-build-of-optee_ta.patch | 45 +++++++++++++++++++
 .../optee-ftpm-stm32mp15x_0~230316+git.bb     |  1 +
 2 files changed, 46 insertions(+)
 create mode 100644 meta-isar/recipes-bsp/optee-ftpm/files/0001-Fix-parallel-build-of-optee_ta.patch

diff --git a/meta-isar/recipes-bsp/optee-ftpm/files/0001-Fix-parallel-build-of-optee_ta.patch b/meta-isar/recipes-bsp/optee-ftpm/files/0001-Fix-parallel-build-of-optee_ta.patch
new file mode 100644
index 00000000..4ee20f41
--- /dev/null
+++ b/meta-isar/recipes-bsp/optee-ftpm/files/0001-Fix-parallel-build-of-optee_ta.patch
@@ -0,0 +1,45 @@
+From ff34f1a64bd5dbc83df26cfc8e74478f854a0acf Mon Sep 17 00:00:00 2001
+From: Jan Kiszka <jan.kiszka@siemens.com>
+Date: Thu, 20 Jul 2023 16:32:26 +0200
+Subject: [PATCH] Fix parallel build of optee_ta
+
+The symlink must be established prio to building any of the source files
+of WolfSSL, or things will fail:
+
+	TA_CROSS_COMPILE= \
+	TA_CPU=cortex-a7 \
+	TA_DEV_KIT_DIR=/usr/lib/optee-os/stm32mp15x/export-ta_arm32 \
+	CFG_TEE_TA_LOG_LEVEL=2 \
+	CFG_FTPM_USE_WOLF=y \
+	/usr/bin/make -j 24
+make[2]: Entering directory '/<<PKGBUILDDIR>>/Samples/ARM32-FirmwareTPM/optee_ta'
+/usr/bin/make -C fTPM CROSS_COMPILE=
+make[3]: Entering directory '/<<PKGBUILDDIR>>/Samples/ARM32-FirmwareTPM/optee_ta/fTPM'
+Checking symlink to the TPM folder: /<<PKGBUILDDIR>>
+Checking symlink to the WolfSSL folder: /<<PKGBUILDDIR>>/external/wolfssl
+Establishing symlink.
+  CC      ../out/fTPM/platform/Cancel.o
+Establishing symlink.
+  CC      ../out/fTPM/platform/AdminPPI.o
+  CC      ../out/fTPM/platform/Entropy.o
+make[3]: *** No rule to make target 'lib/wolf/wolf_symlink/wolfcrypt/src/aes.c', needed by '../out/fTPM/./lib/wolf/wolf_symlink/wolfcrypt/src/aes.o'.  Stop.
+make[3]: *** Waiting for unfinished jobs....
+
+Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
+---
+ Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk b/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
+index 0a43f46..eb239e3 100644
+--- a/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
++++ b/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/lib/wolf/sub.mk
+@@ -56,3 +56,5 @@ srcs-y += wolf_symlink/wolfcrypt/src/tfm.c
+ srcs-y += wolf_symlink/wolfcrypt/src/wolfmath.c
+ srcs-y += wolf_symlink/wolfcrypt/src/des3.c
+ srcs-y += wolf_symlink/wolfcrypt/src/random.c
++
++$(srcs-y): wolf_symlink
+-- 
+2.35.3
+
diff --git a/meta-isar/recipes-bsp/optee-ftpm/optee-ftpm-stm32mp15x_0~230316+git.bb b/meta-isar/recipes-bsp/optee-ftpm/optee-ftpm-stm32mp15x_0~230316+git.bb
index fce13322..589c21fe 100644
--- a/meta-isar/recipes-bsp/optee-ftpm/optee-ftpm-stm32mp15x_0~230316+git.bb
+++ b/meta-isar/recipes-bsp/optee-ftpm/optee-ftpm-stm32mp15x_0~230316+git.bb
@@ -13,6 +13,7 @@ SRC_URI += " \
     https://github.com/Microsoft/ms-tpm-20-ref/archive/${SRCREV}.tar.gz \
     https://github.com/wolfSSL/wolfssl/archive/${SRCREV-wolfssl}.tar.gz;name=wolfssl \
     file://0001-add-enum-to-ta-flags.patch \
+    file://0001-Fix-parallel-build-of-optee_ta.patch \
     "
 
 SRCREV = "f74c0d9686625c02b0fdd5b2bbe792a22aa96cb6"
-- 
2.35.3