configs/freescale_imx91frdm: new defconfig

This commit adds support for the i.MX 91 FRDM (Freedom) board.

The i.MX91 FRDM development board is a low-cost and compact
development board featuring the i.MX91 applications processor.

See: https://nxp.com/FRDM-IMX91

This defconfig is based on freescale_imx93frmd_defconfig, introduced in
commit https://gitlab.com/buildroot.org/buildroot/-/commit/2e05f22ff862192a7e512d0db0486351bba94ae8

Compared to the original freescale_imx93_frmd_defconfig, this defconfig
uses a Bootlin glibc stable external toolchain, to follow guidelines
from: https://elinux.org/Buildroot:DeveloperDaysELCE2024#Rules_for_defconfigs

Signed-off-by: Juan Pablo Montero Castro <juanpablo.monterocastro@nxp.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/freescale/imx91frdm/patches/arm-trusted-firmware/arm-trusted-firmware.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  8cfe0afc903ebbc03f27e4874aa9ce82be78843a8b42ed4c906871e7f311b510  imx-atf-lf-6.6.36-2.1.0.tar.gz

board/freescale/imx91frdm/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/freescale/imx91frdm/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  3f5017e85ba6c490be597670033a7eaba14e3c34af4e53d24dc3762c3deece83  linux-imx-lf-6.6.36-2.1.0-imx91frdm.tar.gz

board/freescale/imx91frdm/patches/uboot/uboot.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  f7d9a6e99825926d0bc597e0fdfeafffcc76ad6267f1d4e9aae1fe9a8d400c22  uboot-imx-lf-6.6.36-2.1.0-imx91frdm.tar.gz

board/freescale/imx91frdm/readme.txt

@@ -0,0 +1,74 @@
+**********************
+NXP i.MX 91 FRDM board
+**********************
+
+This file documents the Buildroot support for the i.MX 91 FRDM
+(Freedom) board. For more information on this board, see [1].
+
+
+Build
+=====
+
+First, configure Buildroot for the i.MX 91 FRDM board:
+
+    make freescale_imx91frdm_defconfig
+
+Build all components:
+
+    make
+
+When this command completes, the generated image containing everything
+to boot from the SD card is located in "output/images/sdcard.img".
+
+
+Create a bootable SD card
+=========================
+
+To determine the device associated to the SD card have a look in the
+/proc/partitions file:
+
+    cat /proc/partitions
+
+Buildroot prepares a bootable "sdcard.img" image in the output/images/
+directory, ready to be dumped on a SD card. Launch the following
+command as root:
+
+    dd if=output/images/sdcard.img of=/dev/<your-sd-device>
+
+*** WARNING! This will destroy all the card content. Use with care! ***
+
+For details about the medium image layout, see the definition in
+board/freescale/common/imx/genimage.cfg.template_imx9.
+
+
+Boot the i.MX 91 FRDM board
+===========================
+
+To boot your newly created system (refer to the i.MX 91 FRDM
+Documentation [2] for guidance):
+- insert the SD card in the SD slot (P13) of the board;
+- Configure the SW1 boot switches as follows:
+  SW1: 1100 SW1[1-4] ("USDHC2 4-bit SD3.0" Boot Mode)
+- connect a USB Type-C cable into the P16 Debug USB Port and connect
+  using a terminal emulator at 115200 bps, 8n1;
+- power on the board by connecting a USB Type-C cable into the P1
+  Power USB Port.
+
+Note 1: the board boot switches default configuration is:
+SW1: 0100 SW1[1-4] ("USDHC1 8-bit eMMC 5.1" Boot Mode)
+and the board is also pre-flashed with a reference Linux demo
+image. It is important to change the boot config switches to make
+sure the system will boot on the SD Card.
+
+Note 2: the debug USB connector presents 2 UARTs (for example
+/dev/ttyACM[0-1]), the Cortex-A55 UART should be the 1st one (in the
+previous example, /dev/ttyACM0). Refer to the documentation [2] for
+more details.
+
+Enjoy!
+
+
+References
+==========
+[1] https://www.nxp.com/FRDM-IMX91
+[2] https://www.nxp.com/document/guide/getting-started-with-frdm-imx91:GS-FRDM-IMX91

configs/freescale_imx91frdm_defconfig

@@ -0,0 +1,43 @@
+BR2_aarch64=y
+BR2_cortex_a55=y
+BR2_ARM_FPU_VFPV4D16=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_AARCH64_GLIBC_STABLE=y
+BR2_GLOBAL_PATCH_DIR="board/freescale/imx91frdm/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttyLP0"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/freescale/common/imx/imx9-bootloader-prepare.sh board/freescale/common/imx/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,jolivain,linux-imx,lf-6.6.36-2.1.0-imx91frdm)/linux-imx-lf-6.6.36-2.1.0-imx91frdm.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="imx_v8"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="freescale/imx91-11x11-frdm"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_PACKAGE_FREESCALE_IMX=y
+BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX91=y
+BR2_PACKAGE_FIRMWARE_ELE_IMX=y
+BR2_PACKAGE_FIRMWARE_IMX=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_TARBALL_LOCATION="$(call github,nxp-imx,imx-atf,lf-6.6.36-2.1.0)/imx-atf-lf-6.6.36-2.1.0.tar.gz"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="imx91"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_BL31=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
+BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,jolivain,uboot-imx,lf-6.6.36-2.1.0-imx91frdm)/uboot-imx-lf-6.6.36-2.1.0-imx91frdm.tar.gz"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="imx91_11x11_frdm"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_NEEDS_GNUTLS=y
+BR2_TARGET_UBOOT_SPL=y
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_IMX_MKIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y