[U-Boot] [PATCH v3 2/3] imx: mx7: Add comment to describe OTP TESTER registers

[Stefano Babic]

On 26/03/2018 16:27, Bryan O'Donoghue wrote:
> The tester registers provide a unique chip-level identifier which
> get_board_serial() returns in a "struct tag_serialnr".
> 
> This patch documents the properties of the registers; in summary.
> 
> 31:0 OCOTP_TESTER0 (most significant)
> - FSL-wide unique, encoded LOT ID STD II/SJC CHALLENGE/ Unique ID
> 
> OCOTP_TESTER1 (least significant)
> 31:24
> - The X-coordinate of the die location on the wafer/SJC CHALLENGE/ Unique
>   ID
> 23:16
> - The Y-coordinate of the die location on the wafer/SJC CHALLENGE/ Unique
>   ID
> 15:11
> - The wafer number of the wafer on which the device was fabricated/SJC
>   CHALLENGE/ Unique ID
> 10:0
> - FSL-wide unique, encoded LOT ID STD II/SJC CHALLENGE/ Unique ID
> 
> The 64 bits of data generate a unique serial number per-chip.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue at linaro.org>
> Cc: Fabio Estevam <fabio.estevam at nxp.com>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Reviewed-by: Fabio Estevam <fabio.estevam at nxp.com>
> ---
>  arch/arm/mach-imx/mx7/soc.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/mx7/soc.c b/arch/arm/mach-imx/mx7/soc.c
> index 1602585..fb92a26 100644
> --- a/arch/arm/mach-imx/mx7/soc.c
> +++ b/arch/arm/mach-imx/mx7/soc.c
> @@ -202,6 +202,27 @@ int arch_misc_init(void)
>  #endif
>  
>  #ifdef CONFIG_SERIAL_TAG
> +/*
> + * OCOTP_TESTER
> + * i.MX 7Solo Applications Processor Reference Manual, Rev. 0.1, 08/2016
> + * OCOTP_TESTER describes a unique ID based on silicon wafer
> + * and die X/Y position
> + *
> + * OCOTOP_TESTER offset 0x410
> + * 31:0 fuse 0
> + * FSL-wide unique, encoded LOT ID STD II/SJC CHALLENGE/ Unique ID
> + *
> + * OCOTP_TESTER1 offset 0x420
> + * 31:24 fuse 1
> + * The X-coordinate of the die location on the wafer/SJC CHALLENGE/ Unique ID
> + * 23:16 fuse 1
> + * The Y-coordinate of the die location on the wafer/SJC CHALLENGE/ Unique ID
> + * 15:11 fuse 1
> + * The wafer number of the wafer on which the device was fabricated/SJC
> + * CHALLENGE/ Unique ID
> + * 10:0 fuse 1
> + * FSL-wide unique, encoded LOT ID STD II/SJC CHALLENGE/ Unique ID
> + */
>  void get_board_serial(struct tag_serialnr *serialnr)
>  {
>  	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
> 

Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic

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