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Joachim Wiberg
ab56c1be50
This commit consolidates all BSP support files into the Buildroot standard board/ directory. The concept of selectable boards in menuconfig remains as-is but now lives in board/ instead. Drop support for board-specific post-build.sh scripts, not needed atm. and we should really use Buildroot _POST_INSTALL_HOOKS in the board .mk files instead. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
65 lines
1.9 KiB
Markdown
65 lines
1.9 KiB
Markdown
Microchip SparX-5i PCB135 (eMMC)
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================================
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At present, only FIT images are supported via the SparX-5i eval
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board's U-Boot, which must contain a valid load address. If you are
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using this board, after selecting your base configuration, run the
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following command to supplement the existing config with the required
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FIT options:
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make board-enable-sparx-fit
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## Unbricking
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1. Don't load a corrupt bootloader to begin with
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2. Done
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If, for some reason, you didn't manage to follow step 1, you can use
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the `FLASH_PROG`(`J4`) connector on the board to access the SPI flash
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directly.
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Using a [Bus Blaster][BB3] in combination with [dangerspi][dangerspi],
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you can load a new bootloader. The schematic below details how to
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connect the Bus Blaster to the board, but the concept should be
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portable to any debugger/device based around an FTDI2232 chip.
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```
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Bus Blaster: FLASH_PROG (J4):
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.---. .---.
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VTG >o o| VTG SCK >o o| GND
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TRST |o o| GND MISO |o o| #RESET_FLASH
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TDI |o o| GND o o| 3V3
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TMS |o o| GND #CS |o o| #SYSRESET
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TCK o o| GND MOSI |o o| GND
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RTCK o o| GND '---'
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TDO |o o| GND
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TSRST |o o| GND
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DBGRQ |o o| GND
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DBGACK |o o| GND
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'---'
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```
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| Bus Blaster | FLASH_PROG |
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|-------------|----------------|
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| `VTG` | `3V3` |
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| `GND` | `GND` |
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| | |
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| `VTG` | `#RESET_FLASH` |
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| `GND` | `#SYSRESET` |
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| `TDI` | `MOSI` |
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| `TMS` | `#CS` |
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| `TCK` | `SCK` |
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| `TDO` | `MISO` |
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With the cable in place, build U-Boot with the correct configuration:
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make fireant_boot_defconfig && make
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To flash it to the board, connect the cable to `J4` and run:
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make board-sparx-flash-uboot
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[BB3]: http://dangerousprototypes.com/docs/Bus_Blaster#Bus_Blaster_v3
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[dangerspi]: https://github.com/wkz/dangerspi
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