MCU-PLUS-SDK-AM243X: Identifying GP and HS Device via Registers

Fabian Sorkalla

Hello,

I am currently trying to evaluate in Code which processor variant the code is running on. Especially if it is a HS or GP device.

We already did something similar in the past with the following register which is not documented in the TRM but is found in "bootloader_soc.c".

#define BOOTLOADER_SYS_STATUS_REG (0x44234100U)

In uint32_t Bootloader_socIsAuthRequired(void) the following code is used to identify if the current processor is a HS or GP device:

uint32_t devType    = CSL_REG32_RD(BOOTLOADER_SYS_STATUS_REG) & BOOTLOADER_SYS_STATUS_DEV_TYPE_MASK;
    uint32_t devSubtype = CSL_REG32_RD(BOOTLOADER_SYS_STATUS_REG) & BOOTLOADER_SYS_STATUS_DEV_SUBTYPE_MASK;

    if((devType == BOOTLOADER_SYS_STATUS_DEV_TYPE_GP)   ||
       (devType == BOOTLOADER_SYS_STATUS_DEV_TYPE_TEST) ||
       (devSubtype == BOOTLOADER_SYS_STATUS_DEV_SUBTYPE_FS))

Today I stumpled across this other register which is documented in the TRM:

Can we also use the SECURITY bit to identify if a device is a HS device? Is this redundant to the other register which is not documented in the TRM?

Thanks

Fabian

EDIT:

Also the Silicon Revision would be nice to know: I found JTAG_ID in the TRM

But this only describes SR 1.0. There should be already a SR2.0 (the current silicon revision)?!

Thanks!

over 2 years ago

+1 Fleenor over 2 years ago

TI__Mastermind 22953 points

Hello Fabian,

1) Yes, the CTRLMMR_JTAG_USER_ID.SECURITY bit can be used to identify if a device is a HS device. Note that all current and future devices are HS devices only.

2) For AM64x/AM243x silicon revisions the "VARIANT" value changes from 0x0 to 0x1.

SR1.0 = 0x0

SR2.0 = 0x1

I have filed the SITARAAPPS-3536 issue to ensure the device identification tables are updated for the next release.

Best Regards,

Zackary Fleenor

0 Fabian Sorkalla over 2 years ago in reply to Fleenor

Prodigy 220 points

HI Zack,

thanks for the answer.

Just out of curiosity:

Whats the difference to the Bootloader Status register?

BOOTLOADER_SYS_STATUS_REG 0x44234100U

Thanks

Fabian

0 Fleenor over 2 years ago in reply to Fabian Sorkalla

TI__Mastermind 22953 points

Hey Fabian,

The bootloader status register reflects the associated CTRLMMR register bitfield values loaded at boot-time.

Best Regards,

Zackary Fleenor

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MCU-PLUS-SDK-AM243X: Identifying GP and HS Device via Registers