imx: Support i.MX93 9X9 QSB board

Add i.MX93 9x9 Quick Start Board support.
 - Two ddr scripts included w/o inline ecc feature.
 - SDHC/NETWORK/I2C/UART supported
 - PCA9450 supported, default over drive mode
 - Documentation added.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/doc/board/nxp/imx93_9x9_qsb.rst b/doc/board/nxp/imx93_9x9_qsb.rst
new file mode 100644
index 0000000..e4dfe47
--- /dev/null
+++ b/doc/board/nxp/imx93_9x9_qsb.rst
@@ -0,0 +1,70 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+imx93_9x9_qsb
+=======================
+
+U-Boot for the NXP i.MX93 Quick Start Board
+
+Quick Start
+-----------
+
+- Get and Build the ARM Trusted firmware
+- Get the DDR firmware
+- Get ahab-container.img
+- Build U-Boot
+- Boot
+
+Get and Build the ARM Trusted firmware
+--------------------------------------
+
+Note: srctree is U-Boot source directory
+Get ATF from: https://github.com/nxp-imx/imx-atf/
+branch: lf_v2.10
+
+.. code-block:: bash
+
+   $ unset LDFLAGS
+   $ make PLAT=imx93 bl31
+   $ cp build/imx93/release/bl31.bin $(srctree)
+
+Get the DDR firmware
+--------------------
+
+.. code-block:: bash
+
+   $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.21.bin
+   $ chmod +x firmware-imx-8.21.bin
+   $ ./firmware-imx-8.21.bin
+   $ cp firmware-imx-8.21/firmware/ddr/synopsys/lpddr4*.bin $(srctree)
+
+Get ahab-container.img
+---------------------------------------
+
+.. code-block:: bash
+
+   $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-sentinel-0.11.bin
+   $ chmod +x firmware-sentinel-0.11.bin
+   $ ./firmware-sentinel-0.11.bin
+   $ cp firmware-sentinel-0.11/mx93a1-ahab-container.img $(srctree)
+
+Build U-Boot
+------------
+
+.. code-block:: bash
+
+   $ export CROSS_COMPILE=aarch64-poky-linux-
+   $ make imx93_9x9_qsb_defconfig or imx93_9x9_qsb_inline_ecc_defconfig
+   $ make
+
+- Inline ECC is to enable DDR ECC feature with imx93_9x9_qsb_inline_ecc_defconfig
+
+Burn the flash.bin to MicroSD card offset 32KB:
+
+.. code-block:: bash
+
+   $ dd if=flash.bin of=/dev/sd[x] bs=1024 seek=32 conv=notrunc
+
+Boot
+----
+
+Set Boot switch to SD boot