Can't get past SDC challenge/response using Codewarrior?

[ddadson]

Hi,

We're making use the trusted architecture on a P1010 based platform. However, we have found we can only successfully pass the SDC challenge-response if we leave the SFP_DRVR registers unprogrammed (i.e. all zeroes). If we program it with a (suitably hamming-bit encoded value), we instead get a "secure debug violation" reported by Codewarrior (v10.5.0) when we enter the programmed value.

We have set these fuses:
SFP_DPR = 0x00000001 (Conditionally closed, without notification)
SFP_DESSR  = 0x00000000
SFP_DRVR[0] = 0x04000800
SFP_DRVR[1] = 0x04000800

We have checked the DRVR value vst gen_drv:
---
$./gen_drv_drbg B 0400080004000800

DRV[63:0] after Hamming Code is:
0400080004000800
 NAME    |     BITS     |    VALUE  
_________|______________|____________
DRV 0    |    31 - 0    | 04000800
DRV 1    |    63 - 32   | 04000800
---

Is there anything we might have missed when setting fuses, or some configuration for Codewarrior that might be incorrect?

Thanks,
David

[yipingwang]

Hello David Dadson,

Please refer to the section "3.5. Programming Debug Challenge/Response Value Register
(DCVR/DRVR)" and "4. Secure debugging using CodeWarrior" in this document Secure Boot/Debug Configuration for LS1 .

Have a great day,
Yiping

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[ddadson]

Hi Yiping,

The linked LS1 docs indicate we should set a value in the "Secure Access register", CSU_SA0. What is the equivalent register on the P1010 ? (I can't find CSU_SA0 in the P1010 reference manual).

Thanks again,

David