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warp7: Set u-boot serial# based on OTP value

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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 <bryan.odonoghue@linaro.org>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Rui Miguel Silva <rui.silva@linaro.org>
Cc: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
This commit is contained in:
Bryan O'Donoghue
2018-03-26 15:27:34 +01:00
committed by Stefano Babic
parent 1ab1ffded4
commit 852cc548b3
2 changed files with 17 additions and 0 deletions
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3
include/configs/warp7.h
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@@ -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" \