PCI Express on my board when setting to read with DMA cause MC

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PCI Express on my board when setting to read with DMA cause MC

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michayardeny
Contributor III

The question is what can be done on the CPU side p1022 to see what is the reason for the PCI to raise MC.

(Machine Check).

Micha

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ufedor
NXP Employee
NXP Employee

Please note that Machine Check can happen only for a CPU read. DMA can't initiate MC.

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ufedor
NXP Employee
NXP Employee

Machine check corresponds to a non-recoverable read failure (i.e. when no data could be returned).

On the P1022 side it is required to check settings of MMU TLBs, LAWs and PCI Outbound windows.

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michayardeny
Contributor III

Basically if I access with 64 bit it has no problem . But with DMA it is an issue.

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ufedor
NXP Employee
NXP Employee

Please note that Machine Check can happen only for a CPU read. DMA can't initiate MC.

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michayardeny
Contributor III

Thanks, the problem I had, was access with the CPU after the DMA was completed, so DMA was OK.

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