Migration from DM814x rev B to rev C - internal register to ID part revision

Anjli Behl

Good day!

Is there an internal register in the DM8148 that will identify the new part as a Rev C device (i.e. an Revision register that will be different between Rev B and Rev C parts)? I need to confirm this because we're going to need to track the boards that are built with the different revisions of parts and we need to make sure there's a mechanism for doing so...

thanks!

AnjliB

over 12 years ago

0 Pavel Botev over 12 years ago

TI__Guru**** 170625 points

Hi,

If by "revision B" device you mean "silicon revision 2.x" device, and by "revision C" device you mean "silicon revision 3.x" device, then:

The silicon revision is determined from the DEVICE_ID[31:28] DEVREV bit field. The DEVICE_ID register is at address 0x48140600.

Here is the u-boot source code, that is responsible for determine the device silicon revision:

/******************************************
* get_cpu_rev(void) - extract rev info
******************************************/
u32 get_cpu_rev(void)
{
   u32 id;
   u32 rev;

   id = readl(DEVICE_ID);
   rev = (id >> 28) & 0xF;

#ifdef CONFIG_TI814X
   /* PG2.1 devices should read 0x3 as chip rev
   * Some PG2.1 devices have 0xc as chip rev
   */
   if (0x3 == rev || 0xc == rev)
       return PG2_1;
   else if (0x4 == rev)
       return PG3_0;
   else
       return PG1_0;
#endif
   return rev;
}

Check also the below threads:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/245169.aspx

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/222257.aspx?Redirected=true

Regards,

Pavel

Processors

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Migration from DM814x rev B to rev C - internal register to ID part revision