From 852cc548b3fdf6d5b46e2a96f876d14608ccdcf4 Mon Sep 17 00:00:00 2001 From: Bryan O'Donoghue Date: Mon, 26 Mar 2018 15:27:34 +0100 Subject: warp7: Set u-boot serial# based on OTP value u-boot has a standard "serial#" environment variable that is suitable for storing the iSerial number we will supply via the USB device descriptor. serial# is automatically picked up by the disk subsystem in u-boot - thus providing a handy unique identifier in /dev/disk/by-id as detailed below. Storing the hardware serial identifier in serial# means we can change the serial# if we want before USB enumeration - thus making iSerial automatic via OTP but overridable if necessary. This patch reads the defined OTP fuse and sets environment variable "serial#" to the value read. With this patch in place the USB mass storage device will appear in /dev/disk/by-id with a unique name based on the OTP value. For example /dev/disk/by-id/usb-Linux_UMS_disk_0_WaRP7-0xf42400d3000001d4-0:0 Signed-off-by: Bryan O'Donoghue Cc: Fabio Estevam Cc: Rui Miguel Silva Cc: Ryan Harkin Reviewed-by: Fabio Estevam --- include/configs/warp7.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/configs/warp7.h') diff --git a/include/configs/warp7.h b/include/configs/warp7.h index fe96988be7..0c3b605de3 100644 --- a/include/configs/warp7.h +++ b/include/configs/warp7.h @@ -24,6 +24,9 @@ #define CONFIG_SYS_FSL_ESDHC_HAS_DDR_MODE #define CONFIG_SYS_MMC_IMG_LOAD_PART 1 +/* Switch on SERIAL_TAG */ +#define CONFIG_SERIAL_TAG + #define CONFIG_DFU_ENV_SETTINGS \ "dfu_alt_info=boot raw 0x2 0x400 mmcpart 1\0" \ -- cgit v1.2.1