Register reads causing synchronous aborts

jwhowell — Tue, 11 Jul 2023 03:46:59 GMT

Performing read operations on some i.MX8 QM registers causes synchronous abort exceptions in Cortex-A53 EL2.

These registers are referenced in the i.MX 8QuadMax Applications Processor Reference Manual (Rev 0).

Reading the Exception Syndrome Register, EL2 (ESR_EL2) gives us the value 0x9600_0210.

Bit fields [23:22] and [1:0] are both equal to 0b00, which according to Arm indicates DECERR on external access. Is this due to a lack of permissions or that the register address is incorrect?

Re: Register reads causing synchronous aborts

joanxie — Tue, 11 Jul 2023 06:41:35 GMT

Performing read operations on some i.MX8 QM registers causes synchronous abort exceptions in Cortex-A53 EL2

>what registers do you read when you get abort exceptions? and what detailed error message did you get? pls share more detailed information with me

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Register reads causing synchronous aborts

Re: Register reads causing synchronous aborts