mirror of
https://github.com/brain-hackers/u-boot-brain
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![]() Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> |
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.. | ||
clk-lib.c | ||
clk-lib.h | ||
config.mk | ||
env-lib.c | ||
env-lib.h | ||
headerize-hsdk.py | ||
hsdk.c | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
================================================================================ Useful notes on bulding and using of U-Boot on ARC HS Development Kit (AKA HSDK) ================================================================================ BOARD OVERVIEW The DesignWare ARC HS Development Kit is a ready-to-use platform for rapid software development on the ARC HS3x family of processors. For more information please visit: https://www.synopsys.com/dw/ipdir.php?ds=arc-hs-development-kit User guide is availalble here: https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf It has the following features useful for U-Boot: * On-board 2-channel FTDI TTL-to-USB converter - The first channel is used for serial debug port (which makes it possible to use a serial connection on pretty much any host machine be it Windows, Linux or Mac). On Linux machine typucally FTDI serial port would be /dev/ttyUSB0. There's no HW flow-control and baud-rate is 115200. - The second channel is used for built-in Digilent USB JTAG probe. That means no extra hardware is required to access ARC core from a debugger on development host. Both proprietary MetaWare debugger and open source OpenOCD + GDB client are supported. - Also with help of this FTDI chip it is possible to reset entire board with help of a special `rff-ftdi-reset` utility, see: https://github.com/foss-for-synopsys-dwc-arc-processors/rff-ftdi-reset * Micro SD-card slot - U-Boot expects to see the very first partition on the card formatted as FAT file-system and uses it for keeping its environment in `uboot.env` file. Note uboot.env is not just a text file but it is auto-generated file created by U-Boot on invocation of `saveenv` command. It contains a checksum which makes this saved environment invalid in case of maual modification. - There might be more useful files on that first FAT partition like Linux kernl image in form of uImage (with or without built-in initramfs), device tree blob (.dtb) etc. - Except FAT partition there might be others following the first FAT one like Ext file-system with rootfs etc. * 1 Gb Ethernet socket - U-Boot might get payload from TFTP server. This might be uImage, rootfs image and anything else. * 2 MiB of SPI-flash - SPI-flahs is used as a storage for image of an application auto-executed by bootROM on power-on. Typically U-Boot gets programmed there but there might be other uses. But note bootROM expects to find a special header preceeding application image itself so before flashing anything make sure required image is prepended. In case of U-Boot this is done by invocation of `headerize-hsdk.py` with `make bsp-generate` command. BUILDING U-BOOT 1. Configure U-Boot: ------------------------->8---------------------- make hsdk_defconfig ------------------------->8---------------------- 2. To build Elf file (for example to be used with host debugger via JTAG connection to the target board): ------------------------->8---------------------- make mdbtrick ------------------------->8---------------------- This will produce `u-boot` Elf file. 3. To build artifacts required for U-Boot update in n-board SPI-flash: ------------------------->8---------------------- make bsp-generate ------------------------->8---------------------- This will produce `u-boot.head` and `u-boot-update.scr` which should be put on the first FAT partition of micro SD-card to be inserted in the HSDK board. Note that Python3 script is used for generation of a header, thus to get that done it's required to have Python3 with "pyelftools" installed. "pyelftools" could be installed with help of "pip" even w/o root rights: ------------------------->8---------------------- python3 -m pip install --user pyelftools ------------------------->8---------------------- EXECUTING U-BOOT 1. The HSDK board is supposed to auto-start U-Boot image stored in on-board SPI-flash on power-on. For that make sure DIP-switches in the corner of the board are in their default positions: BIM in 1:off, 2:on state while both BMC and BCS should be in 1:on, 2:on state. 2. Though it is possible to load U-Boot as a simple Elf file via JTAG right in DDR and start it from the debugger. 2.1. In case of proprietary MetaWare debugger run: ------------------------->8---------------------- mdb -digilent -run -cl u-boot ------------------------->8---------------------- UPDATION U-BOOT IMAGE IN ON-BOARD SPI-FLASH 1. Create `u-boot.head` and `u-boot-update.scr` as discribed above with `make bsp-generate` command. 2. Copy `u-boot.head` and `u-boot-update.scr` to the first FAT partition of micro SD-card. 3. Connect USB cable from the HSDK board to the developemnt host and fire-up serial terminal. 3. Insert prepared micro SD-card in the HSDK board, press reset button and stop auto-execution of existing `bootcmd` pressing any key in serial terminal and enter the following command: ------------------------->8---------------------- mmc rescan && fatload mmc 0:1 ${loadaddr} u-boot-update.scr && source ${loadaddr} ------------------------->8---------------------- Wait before you see "u-boot update: OK" message. 4. Press RESET button and enjoy updated U-Boot version.