[PATCH v1 4/5] board: toradex: verdin-imx8mm: add README

[Igor Opaniuk]

From: Igor Opaniuk <igor.opaniuk at toradex.com>

Add README with build steps for U-boot and TF-A for Verdin i.MX8MM SoM.

Signed-off-by: Igor Opaniuk <igor.opaniuk at toradex.com>
---

 board/toradex/verdin-imx8mm/README | 81 ++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 board/toradex/verdin-imx8mm/README

diff --git a/board/toradex/verdin-imx8mm/README b/board/toradex/verdin-imx8mm/README
new file mode 100644
index 0000000000..857138d4fb
--- /dev/null
+++ b/board/toradex/verdin-imx8mm/README
@@ -0,0 +1,81 @@
+U-Boot for the Toradex Verdin i.MX8MM  board
+
+Quick Start
+===========
+- Build the ARM Trusted firmware binary
+- Get DDR firmware
+- Build U-Boot
+- Flash to eMMC
+- Boot
+
+
+Get and Build the ARM Trusted firmware (Trusted Firmware A)
+======================================
+$ echo "Downloading and building TF-A..."
+$ git clone -b imx_4.14.78_1.0.0_ga https://source.codeaurora.org/external/imx/imx-atf
+$ cd imx-atf
+
+Please edit `plat/imx/imx8mm/include/platform_def.h` so it
+contains proper values for UART configuration and BL31 base
+address (correct values listed below):
+#define BL31_BASE                      0x910000
+#define IMX_BOOT_UART_BASE             0x30860000
+#define DEBUG_CONSOLE                  1
+
+Then build ATF (TF-A):
+$ make PLAT=imx8mm bl31
+
+Get the DDR firmware
+=============================
+$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.1.1.bin
+$ chmod +x firmware-imx-8.1.1.bin
+$ ./firmware-imx-8.1.1.bin
+$ cp firmware-imx-8.1.1/firmware/ddr/synopsys/lpddr4*.bin ./
+
+Build U-Boot
+============
+$ export CROSS_COMPILE=aarch64-poky-linux-
+$ make verdin-imx8mm_defconfig
+$ make flash.bin
+
+Flash to eMMC
+===========
+> tftpboot ${loadaddr} flash.bin
+> setexpr blkcnt ${filesize} + 0x1ff && setexpr blkcnt ${blkcnt} / 0x200
+> mmc dev 0 1 && mmc write ${loadaddr} 0x2 ${blkcnt}
+
+Boot
+===========
+
+ATF, U-boot proper and u-boot.dtb images are packed into FIT image,
+which is loaded and parsed by SPL.
+
+Boot sequence is:
+SPL ---> ATF (TF-A) ---> U-boot proper
+
+Output:
+
+U-Boot SPL 2020.01-01840-gd92bdc79cf-dirty (Jan 22 2020 - 18:50:57 +0200)
+Normal Boot
+Trying to boot from MMC1
+NOTICE:  Configuring TZASC380
+NOTICE:  RDC off
+NOTICE:  BL31: v1.5(release):p9.0.0_1.1.0-ga-20190801-0-gd6451cc1e-dirty
+NOTICE:  BL31: Built : 17:43:07, Jan 22 2020
+NOTICE:  sip svc init
+
+
+U-Boot 2020.01-01840-gd92bdc79cf-dirty (Jan 22 2020 - 18:50:57 +0200)
+
+CPU:   Freescale i.MX8MMQ rev1.0 at 0 MHz
+Reset cause: POR
+DRAM:  2 GiB
+MMC:   FSL_SDHC: 0, FSL_SDHC: 1
+Loading Environment from MMC... OK
+In:    serial
+Out:   serial
+Err:   serial
+Model: Toradex Verdin iMX8M Mini 2GB Wi-Fi / BT IT V1.0A, Serial# 06535148
+Net:   Could not get PHY for FEC0: addr 7
+eth0: ethernet at 30be0000
+Hit any key to stop autoboot:  0
-- 
2.17.1