i.MX ProcessorsのトピックOCRAM not accessible on IMX8QM-MEK

OCRAM not accessible on IMX8QM-MEK

nagabhushan_v — Sun, 09 Jun 2019 16:06:45 GMT

We received newer version of the IMX8QM-MEK boards and I was trying to access OCRAM to perform some memory tests. This OCRAM region (0x100000 - 0x13FFFF) doesn't seem to be accessible. I am booting the board using u-boot and loading an application on top of it. I see that this region of memory is not accessible by u-boot as well.

However this was accessible in the previous version of the board.

I tried using the SC APIs to assign the memory region but wasn't successful (find memory API returns - not found error). What do i need to do to access this region? I presume the SCFW has changed and doesn't allow access?

U-Boot version loaded on the new board - U-Boot 2018.03-imx_v2018.03_4.14.98_2.0.0_ga

Re: OCRAM not accessible on IMX8QM-MEK

igorpadykov — Mon, 10 Jun 2019 23:40:38 GMT

Hi Nagabhushan

one can try to fully rebuild image using latest patches, "Linux 4.14.98_2.0.1-Patch"

i.MX Software | NXP

note, recommended to use configuration derived from latest Register Programming Aid

and latest ddr test: mx8_ddr_stress_test_ER9.

Best regards
igor
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Re: OCRAM not accessible on IMX8QM-MEK

nagabhushan_v — Tue, 18 Jun 2019 05:04:19 GMT

Thank you Igor. I tried building the fsl-core-image-base images for Patch 4.14.98_2.0.1-Patch as you suggested but I still wasn't able to access the OCRAM.

Also I see that in A0 boards the SECO firmware (ahab-container.image) was not required but is now included in B0. Is this making the OCRAM secure?

Re: OCRAM not accessible on IMX8QM-MEK

igorpadykov — Tue, 18 Jun 2019 09:35:03 GMT

Hi Nagabhushan

I sent list of changes via mail, please note that

i.MX8QM is not publicly released yet and not fully supported.

May be suggested to proceed with help of extended support of

NXP Professional Services | NXP

Best regards
igor

Re: OCRAM not accessible on IMX8QM-MEK

nagabhushan_v — Tue, 18 Jun 2019 14:14:08 GMT

Thank you, Igor. The change log was helpful.