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diff --git a/board/synopsys/hsdk/README b/board/synopsys/hsdk/README new file mode 100644 index 0000000000..e3793e4829 --- /dev/null +++ b/board/synopsys/hsdk/README @@ -0,0 +1,121 @@ +================================================================================ +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. + + + 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 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. |