ARM: i.MX: Add i.MX8MM EVK board support

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 71 insertions, 0 deletions

diff --git a/Documentation/boards/imx/nxp-imx8mm-evk.rst b/Documentation/boards/imx/nxp-imx8mm-evk.rst
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+NXP i.MX8MM EVK Evaluation Board
+================================
+
+Board comes with:
+
+* 2GiB of LPDDR4 RAM
+* 16GiB eMMC
+
+Not including booting via serial, the device can boot from either SD or eMMC.
+
+Downloading DDR PHY Firmware
+----------------------------
+
+As a part of DDR intialization routine NXP i.MX8MM EVK requires and
+uses several binary firmware blobs that are distributed under a
+separate EULA and cannot be included in Barebox. In order to obtain
+them do the following::
+
+ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.0.bin
+ chmod +x firmware-imx-8.0.bin
+ ./firmware-imx-8.0.bin
+
+Executing that file should produce a EULA acceptance dialog as well as
+result in the following files:
+
+- lpddr4_pmu_train_1d_dmem.bin
+- lpddr4_pmu_train_1d_imem.bin
+- lpddr4_pmu_train_2d_dmem.bin
+- lpddr4_pmu_train_2d_imem.bin
+
+As a last step of this process those files need to be placed in
+"firmware/"::
+
+  for f in lpddr4_pmu_train_1d_dmem.bin  \
+           lpddr4_pmu_train_1d_imem.bin  \
+	   lpddr4_pmu_train_2d_dmem.bin  \
+	   lpddr4_pmu_train_2d_imem.bin; \
+  do \
+	   cp firmware-imx-8.0/firmware/ddr/synopsys/${f} \
+	      firmware/${f}; \
+  done
+
+DDR Configuration Code
+======================
+
+The following two files:
+
+  - arch/arm/boards/nxp-imx8mq-evk/ddr_init.c
+  - arch/arm/boards/nxp-imx8mq-evk/ddrphy_train.c
+
+were obtained by running i.MX 8M DDR Tool that can be found here:
+
+https://community.nxp.com/docs/DOC-340179
+
+Only minimal amount of necessary changes were made to those files.
+All of the "impedance matching" code is located in "ddr.h".
+
+Build barebox
+=============
+
+ make imx_v8_defconfig
+ make
+
+Start barebox
+=============
+
+The resulting image file is images/barebox-nxp-imx8mm-evk.img. Configure the
+board for serial download mode as printed on the PCB. You can start barebox with
+the imx-usb-loader tool that comes with barebox like this:
+
+./scripts/imx/imx-usb-loader images/barebox-nxp-imx8mm-evk.img