fix(build): AM62LX OP-TEE and U-Boot build steps

Building U-Boot with current SDK documentation steps results in
missing tee-os blob errors on AM62LX. Include OP-TEE support in
U-Boot build steps to resolve this.

AM62LX SDK does not include 32-bit ARM toolchain (k3r5-devkit),
unlike other K3 platforms. Remove CROSS_COMPILE_32 requirement
from OP-TEE build commands and add CFG_USER_TA_TARGETS=ta_arm64
to restrict OP-TEE to build only 64-bit TAs.

This resolves "cannot find libgcc.a" errors during OP-TEE build
and "missing external blobs" errors during U-Boot build.

Signed-off-by: Shiva Tripathi <[email protected]>

Author: shiva-ti

source/linux/Foundational_Components/U-Boot/BG-Build-K3.rst

@@ -447,6 +447,7 @@ Go :ref:`here <download-and-install-sdk>` to download and install the SDK.
       $ export UBOOT_DIR=<path-to-ti-u-boot>
       $ export TI_LINUX_FW_DIR=<path-to-ti-linux-firmware>
       $ export TFA_DIR=<path-to-arm-trusted-firmware>
+      $ export OPTEE_DIR=<path-to-ti-optee-os>
 
    .. note::
 
@@ -465,7 +466,8 @@ Go :ref:`here <download-and-install-sdk>` to download and install the SDK.
       $ make CROSS_COMPILE="$CROSS_COMPILE_64" \
          BL1=$TFA_DIR/build/k3/am62l/release/bl1.bin \
          BL31=$TFA_DIR/build/k3/am62l/release/bl31.bin \
-         BINMAN_INDIRS=$TI_LINUX_FW_DIR
+         BINMAN_INDIRS=$TI_LINUX_FW_DIR \
+         TEE=$OPTEE_DIR/out/arm-plat-k3/core/tee-pager_v2.bin
 
 .. ifconfig:: CONFIG_part_variant not in ('AM64X', 'AM62X', 'AM62AX', 'AM62LX')
 

source/linux/Foundational_Components_OPTEE.rst

@@ -50,16 +50,32 @@ Building OP-TEE OS
 Building the OP-TEE image
 *************************
 
+.. ifconfig:: CONFIG_part_variant not in ('AM62LX')
+
   .. parsed-literal::
 
-     $ make CROSS_COMPILE="$CROSS_COMPILE_32" CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y
+   $ make CROSS_COMPILE="$CROSS_COMPILE_32" CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y
+
+.. ifconfig:: CONFIG_part_variant in ('AM62LX')
+
+  .. parsed-literal::
+
+   $ make CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_USER_TA_TARGETS=ta_arm64
 
 Building the OP-TEE image with debug parameters
 ***********************************************
 
+.. ifconfig:: CONFIG_part_variant not in ('AM62LX')
+
+  .. parsed-literal::
+
+   $ make CROSS_COMPILE="$CROSS_COMPILE_32" CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_TEE_CORE_LOG_LEVEL=2 CFG_TEE_CORE_DEBUG=y
+
+.. ifconfig:: CONFIG_part_variant in ('AM62LX')
+
   .. parsed-literal::
 
-     $ make CROSS_COMPILE="$CROSS_COMPILE_32" CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_TEE_CORE_LOG_LEVEL=2 CFG_TEE_CORE_DEBUG=y
+   $ make CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_TEE_CORE_LOG_LEVEL=2 CFG_TEE_CORE_DEBUG=y CFG_USER_TA_TARGETS=ta_arm64
 
 .. _building-optee-with-prng:
 
@@ -71,10 +87,18 @@ detrimental effect to the overall system latency. Using the
 ``CFG_WITH_SOFTWARE_PRNG`` flag to use OP-TEE's Pseudo RNG drivers as a source
 of entropy can work around these issues.
 
-.. parsed-literal::
+.. ifconfig:: CONFIG_part_variant not in ('AM62LX')
+
+  .. parsed-literal::
 
    $ make CROSS_COMPILE="$CROSS_COMPILE_32" CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=k3-|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_WITH_SOFTWARE_PRNG=y
 
+.. ifconfig:: CONFIG_part_variant in ('AM62LX')
+
+  .. parsed-literal::
+
+   $ make CROSS_COMPILE64="$CROSS_COMPILE_64" PLATFORM=k3-|__OPTEE_PLATFORM_FLAVOR__| CFG_ARM64_core=y CFG_WITH_SOFTWARE_PRNG=y CFG_USER_TA_TARGETS=ta_arm64
+
 .. _secure-storage-with-rpmb:
 
 OP-TEE Secure Storage