feat: add generic rpi_arm64_defconfig configuration

This commit adds the u-boot configuration for building
u-boot for generic arm64 Raspberry Pi models. The config
uses the device-tree provided by the firmware rather
than embedding one; it's the only configuration that
lists Compute Module 4 support.

Ref: https://github.com/u-boot/u-boot/blob/master/doc/board/broadcom/raspberrypi.rst

Signed-off-by: Kris Reeves <kris@pressbuttonllc.com>
Signed-off-by: Noel Georgi <git@frezbo.dev>

u-boot/pkg.yaml

@@ -33,6 +33,7 @@ steps:
       LIBRETECH_ALL_H3_CC_H5_U_BOOT: libretech_all_h3_cc_h5_u-boot
       ROCK64_RK3328_U_BOOT: rock64_rk3328_u-boot
       RPI_ARM64_U_BOOT: rpi_4_u-boot
+      RPI_ARM64_GENERIC_U_BOOT: rpi_generic_u-boot
       BANANAPI_M64_U_BOOT: bananapi_m64_u-boot
       PINE64_U_BOOT: pine64_u-boot
       ROCK_PI_4_RK3399_U_BOOT: rock-pi-4-rk3399_u-boot
@@ -82,6 +83,13 @@ steps:
         cd ${RPI_ARM64_U_BOOT}
         make rpi_4_defconfig
         sed -i "s/CONFIG_TOOLS_LIBCRYPTO=y/# CONFIG_TOOLS_LIBCRYPTO is not set/" .config
+      # rpi_generic (built with rpi_arm64_defconfig, which "uses the device-tree provided by the firmware")
+      - |
+        mkdir ${RPI_ARM64_GENERIC_U_BOOT}
+        tar -xjf u-boot.tar.bz2 --strip-components=1 -C ${RPI_ARM64_GENERIC_U_BOOT}
+        cd ${RPI_ARM64_GENERIC_U_BOOT}
+        make rpi_arm64_defconfig
+        sed -i "s/CONFIG_TOOLS_LIBCRYPTO=y/# CONFIG_TOOLS_LIBCRYPTO is not set/" .config
       # bananapi_m64
       - |
         mkdir ${BANANAPI_M64_U_BOOT}
@@ -181,6 +189,10 @@ steps:
         cd ${RPI_ARM64_U_BOOT}
         export BL31=$(pwd)/${RPI_4_A64_ARM_TRUSTED_FIRMWARE}/build/rpi4/release/bl31.bin
         make -j $(nproc) HOSTLDLIBS_mkimage="-lssl -lcrypto"
+      # rpi_generic
+      - |
+        cd ${RPI_ARM64_GENERIC_U_BOOT}
+        make -j $(nproc) HOSTLDLIBS_mkimage="-lssl -lcrypto"
       # bananapi_m64
       - |
         export BL31=$(pwd)/${SUN50I_A64_ARM_TRUSTED_FIRMWARE}/build/sun50i_a64/release/bl31.bin
@@ -238,6 +250,10 @@ steps:
         mkdir -p /rootfs/rpi_4
         cp -v ${RPI_ARM64_U_BOOT}/u-boot.bin /rootfs/rpi_4
         cp $(pwd)/${RPI_4_A64_ARM_TRUSTED_FIRMWARE}/build/rpi4/release/bl31.bin /rootfs/rpi_4
+      # rpi_generic
+      - |
+        mkdir -p /rootfs/rpi_generic
+        cp -v ${RPI_ARM64_GENERIC_U_BOOT}/u-boot.bin /rootfs/rpi_generic/u-boot.bin
       # bananapi_m64
       - |
         mkdir -p /rootfs/bananapi_m64