Subject: [PATCH] arm: Add extra boot device (UART) to run Ymodem u-boot.img boot on XEA (imx28)

This commit enables imx28 based XEA board's u-boot.sb (SPL) to download u-boot proper (u-boot.img) via Ymodem protocol.

This is extremely useful in the recovery scenario where u-boot.sb is downloaded via uuu utility to SDRAM [*], and then one can upload u-boot proper via serial console to fully debrick the device.

Note - debricking procedure of imx28 devices:

• NXP's original USB based tools (like mxsldr or uuu) expect single u-boot.sb which is a relic of the old U-Boot (~2013) without SPL and U-Boot proper distinction.

[*] On Host:

cat << EOF > imx28_xea.lst uuu_version 1.3.0 SDPS: boot -f /srv/tftp/xea/u-boot.sb SDPU: done EOF

Please start picocom: sudo picocom -b 115200 -s "sz -vv" /dev/ttyUSB1 sudo ./uuu/uuu -V imx28_xea.lst

On the U-boot console one shall see: Trying to boot from UART CCC

Then please press CTRL+A, S and type u-boot.img

Signed-off-by: Lukasz Majewski lukma@denx.de

Acked-by: Peng Fan peng.fan@nxp.com

---

board/liebherr/xea/xea.c | 1 + configs/imx28_xea_defconfig | 1 + 2 files changed, 2 insertions(+)

diff --git a/board/liebherr/xea/xea.c b/board/liebherr/xea/xea.c index 8159f3a2d9..4062c6fb82 100644 --- a/board/liebherr/xea/xea.c +++ b/board/liebherr/xea/xea.c @@ -116,6 +116,7 @@ void board_boot_order(u32 *spl_boot_list) { spl_boot_list[0] = BOOT_DEVICE_MMC1; spl_boot_list[1] = BOOT_DEVICE_SPI;

• spl_boot_list[2] = BOOT_DEVICE_UART;

}

int spl_start_uboot(void) diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig index b879de5042..38f3fa6871 100644 --- a/configs/imx28_xea_defconfig +++ b/configs/imx28_xea_defconfig @@ -36,6 +36,7 @@ CONFIG_SPL_MMC_TINY=y CONFIG_SPL_DM_SPI_FLASH=y CONFIG_SPL_OS_BOOT=y CONFIG_SPL_SPI_LOAD=y +CONFIG_SPL_YMODEM_SUPPORT=y CONFIG_HUSH_PARSER=y CONFIG_CMD_SPL=y CONFIG_CMD_ASKENV=y -- 2.20.1