CCM_CBCMR register value not at default indicated in data-sheet

[ts]

Hi,

We're trying to bring up a new i.mx6q design and using DS-5 over jtag.  The CCM_CBCMR (0x020c4018) register value observed is always 0x004A0324 and not 0x00022324 as indicated in data sheet.

Does the boot-rom modify default register values or is there some other setting (e.g. efuses) that we need to look at to know why our register values don't match defaults?

thanks,

Tarak

[Yuri · Accepted solution]

Yes, the boot ROM can change clock settings, using fuse parameters, please look at section 8.4.3 (Clocks at Boot Time)
and section 8.3.1 (Boot eFUSE Descriptions) of the i.MX6Q Reference Manual.