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f1bdb63ff4
512B is not a correct size to express "512 bytes", and causes a genimage failure: ERROR: Invalid size suffix 'B' in '512B' To express "512 bytes", using just "512" is sufficient. With this commit, genimage works fine, and we indeed have a 512 bytes unused partition: $ fdisk -l output/images/sdcard.img Disk output/images/sdcard.img: 60 MiB, 62915584 bytes, 122882 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x00000000 Device Boot Start End Sectors Size Id Type output/images/sdcard.img1 1 1 1 512B 0 Empty output/images/sdcard.img2 2 524289 524288 256M 83 Linux Fixes: https://gitlab.com/buildroot.org/buildroot/-/jobs/88314963 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Technologic Systems TS-7680 SBC
===============================
This document explains how to set up a basic Buildroot system for
the Technologic Systems TS-7680 Single Board Computer.
The TS-7680 SBC is based on the Freescale i.MX286 ARM ARM926EJ-S
running at 454MHz. The TS-7680 features are 10/100 Ethernet ports,
Wi-Fi, microSD card, eMMC, NOR Flash, USB host port, CAN ports,
relays and ADC/DAC. More details on the board here:
https://wiki.embeddedarm.com/wiki/TS-7680
The TS-7680 uses a 3.14.28 Linux kernel provided by
Technologic Systems.
To build the default configuration you only have to run:
$ make ts7680_defconfig
$ make
The output looks like:
output/images
├── imx28-ts7680.dtb
├── rootfs.ext2
├── rootfs.ext4 -> rootfs.ext2
├── rootfs.tar
├── sdcard.img
└── uImage
The provided genimage configuration generates an image file containing
two partitions. The first one is unused, but mandatory as the
TS-7680 built-in bootloader loads the Linux uImage from the /boot
directory in the second partition. The second partition contains the
rootfs with the Linux uImage into the /boot directory.
$ fdisk output/images/sdcard.img
output/images/sdcard.img1 1 1 1 512B 0 Empty
output/images/sdcard.img2 2 524289 524288 256M 83 Linux
This image can be directly written to an SD card.
$ sudo dd if=output/images/sdcard.img of=/dev/mmcblk0
To boot with Buildroot, insert this SD card on the board, make sure
the SD jumper is present and the U-Boot jumper is not.
The bootloader comes pre-flashed on the board on an SPI flash. Since
updating the bootloader is risky and not trivial, it is not included
in the Buildroot defconfig. Refer to
https://wiki.embeddedarm.com/wiki/TS-7680#U-Boot for details on
which U-Boot config to use and how to flash it.