Hi Stefan,
On Tue, Jul 02, 2019 at 08:36:37AM +0200, Stefan Riedmueller wrote:
> Read the unified ID of the i.MX 6 SOCs and print it in the boot log.
>
> Signed-off-by: Stefan Riedmueller <s.riedmueller@xxxxxxxxx>
> ---
> arch/arm/mach-imx/imx6.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/arch/arm/mach-imx/imx6.c b/arch/arm/mach-imx/imx6.c
> index e898be9ab545..66f3d22a68a7 100644
> --- a/arch/arm/mach-imx/imx6.c
> +++ b/arch/arm/mach-imx/imx6.c
> @@ -23,6 +23,7 @@
> #include <mach/reset-reason.h>
> #include <mach/imx6-anadig.h>
> #include <mach/imx6-regs.h>
> +#include <mach/imx6-fusemap.h>
> #include <mach/usb.h>
> #include <asm/mmu.h>
> #include <asm/cache-l2x0.h>
> @@ -38,6 +39,9 @@
> #define BM_CLPCR_COSC_PWRDOWN (0x1 << 11)
> #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS (0x1 << 21)
>
> +#define MX6_OCOTP_CFG0 0x410
> +#define MX6_OCOTP_CFG1 0x420
> +
> static void imx6_init_lowlevel(void)
> {
> void __iomem *aips1 = (void *)MX6_AIPS1_ON_BASE_ADDR;
> @@ -186,17 +190,30 @@ int imx6_cpu_revision(void)
> return soc_revision;
> }
>
> +static u64 imx6_uid(void)
> +{
> + void __iomem *ocotpbase = IOMEM(MX6_OCOTP_BASE_ADDR);
> + u64 uid;
> +
> + uid = ((u64)readl(ocotpbase + MX6_OCOTP_CFG0) << 32);
> + uid |= (u64)readl(ocotpbase + MX6_OCOTP_CFG1);
> +
> + return uid;
> +}
I think this function should be exported in case somebody wants to
actually do something with this value other than printing it during
boot.
Sascha
--
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