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U-Boot SPL configures pinmuxes, clocks and other low-level devices. On the Xilinx ZynqMP SoCs the code to do this resides in a file called psu_init_gpl.c which is initially generated by the Xilinx development tools. Add an option to pass these files from the outside (e.g. in the board files). For this to work properly, a patch to U-Boot is needed. However this patch must be applied by each defconfig using BR2_TARGET_UBOOT_ZYNQMP_PSU_INIT_DIR. If it were in boot/uboot/ to be applied unconditionally, it would break the build for configs using a U-Boot version where the patch is already applied. Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Cc: Joel Carlson <joelsoncarl@gmail.com> Reviewed-by: Joel Carlson <JoelsonCarl@gmail.com> Tested-by: Joel Carlson <JoelsonCarl@gmail.com> [Thomas: add comment about U-Boot version requirements to use this option.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
********************************
Xilinx ZCU106 board - ZynqMP SoC
********************************
This document describes the Buildroot support for the ZCU106 board by
Xilinx, based on the Zynq UltraScale+ MPSoC (aka ZynqMP). It has been
tested with the EK-U1-ZCU106-ES2 pre-production board.
How to build it
===============
Configure Buildroot:
$ make zynqmp_zcu106_defconfig
Compile everything and build the rootfs image:
$ make
Result of the build
-------------------
After building, you should get a tree like this:
output/images/
+-- atf-uboot.ub
+-- bl31.bin
+-- boot.bin
+-- boot.vfat
+-- Image
+-- rootfs.ext2
+-- rootfs.ext4 -> rootfs.ext2
+-- sdcard.img
+-- system.dtb -> zynqmp-zcu106-revA.dtb
+-- u-boot.bin
`-- zynqmp-zcu106-revA.dtb
How to write the SD card
========================
WARNING! This will destroy all the card content. Use with care!
The sdcard.img file is a complete bootable image ready to be written
on the boot medium. To install it, simply copy the image to an SD
card:
# dd if=output/images/sdcard.img of=/dev/sdX
Where 'sdX' is the device node of the SD.
Eject the SD card, insert it in the board, and power it up.