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bde832f710
Update to use the official linux kernel v5.10 instead of an out-of-tree kernel, and use the official U-Boot v2021.01 as the bootloader. Provide two configuration files of genimage for different boot flows: - Boot from SD card (default) - Boot from SPI flash A boot script is generated to automatically boot the distro. Signed-off-by: Bin Meng <bin.meng@windriver.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
116 lines
3.4 KiB
Plaintext
116 lines
3.4 KiB
Plaintext
SiFive HiFive Unleashed
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=======================
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This file describes how to use the pre-defined Buildroot
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configuration for the SiFive HiFive Unleashed board.
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Further information about the HiFive Unleashed board can be found
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at https://www.sifive.com/boards/hifive-unleashed
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Building
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========
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Configure Buildroot using the default board configuration:
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$ make hifive_unleashed_defconfig
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Customise the build as necessary:
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$ make menuconfig
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Start the build:
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$ make
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Result of the build
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===================
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Once the build has finished you will have the following files:
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output/images/
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+-- boot.scr
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+-- fw_dynamic.bin
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+-- fw_dynamic.elf
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+-- fw_jump.bin
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+-- fw_jump.elf
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+-- hifive-unleashed-a00.dtb
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+-- Image
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+-- rootfs.cpio
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+-- rootfs.ext2
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+-- rootfs.ext4
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+-- rootfs.tar
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+-- sdcard.img
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+-- u-boot.bin
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+-- u-boot.itb
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+-- u-boot-spl.bin
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Creating a bootable SD card with genimage
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=========================================
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By default Buildroot builds a SD card image for you. All you need to do
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is dd the image to your SD card, which can be done with the following
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command on your development host:
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$ sudo dd if=output/images/sdcard.img of=/dev/sdb bs=4096
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The above example command assumes the SD card is accessed via a USB card
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reader and shows up as /dev/sdb on the host. Adjust it accordingly per
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your actual setup.
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Booting the SD card on the board
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================================
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Make sure that the all DIP switches are set to the off position for
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default boot mode (MSEL mode = 1011), insert the SD card and power
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up the board.
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Connect the USB cable and open minicom (/dev/ttyUSB1, 115200, 8N1).
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See the 'SiFive HiFive Unleashed Getting Started Guide' for
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more details (https://www.sifive.com/documentation).
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You will get a warning reported by fdisk when you examine the SD card.
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This is because the genimage_sdcard.cfg file doesn't specify the SD card
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size (as people will naturally have different sized cards), so the
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secondary GPT header is placed after the rootfs rather than at the end
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of the disk where it is expected to be.
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You will see something like this at boot time:
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[ 0.989458] mmc0: host does not support reading read-only switch, assuming write-enable
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[ 0.996772] mmc0: new SDHC card on SPI
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[ 1.001634] mmcblk0: mmc0:0000 SD8GB 7.28 GiB
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[ 1.038079] GPT:Primary header thinks Alt. header is not at the end of the disk.
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[ 1.044759] GPT:52389 != 15264767
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[ 1.048051] GPT:Alternate GPT header not at the end of the disk.
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[ 1.054015] GPT:52389 != 15264767
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[ 1.057323] GPT: Use GNU Parted to correct GPT errors.
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[ 1.062479] mmcblk0: p1 p2 p3
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Creating a bootable SPI flash with genimage
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===========================================
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Adjust Buildroot configuration by:
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$ make menuconfig
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Change "System configuration" -> "Extra arguments passed to custom scripts"
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value to "-c board/sifive/hifive-unleashed/genimage_spi-nor.cfg", save the
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configuration and build. This creates a output/images/spi-nor.img that can
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be programmed to the on-board SPI flash.
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Boot the board from the SD card prepared above, stop the U-Boot auto boot,
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and type the following commands to program the whole SPI flash:
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=> tftp 82000000 output/images/spi-nor.img
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=> sf probe
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=> sf update 82000000 0 2000000
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Booting the SPI flash on the board
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==================================
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Make sure that the all DIP switches are set to the off position for
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default boot mode (MSEL mode = 0110) to boot from SPI flash.
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