iMX8M Plus PCIe prefetchable memory

kentmeyer — Thu, 02 Sep 2021 21:06:04 GMT

Per the post https://community.nxp.com/t5/i-MX-Processors/Can-not-allocate-PCIe-region-when-size-is-8M-on-Sabre-platform/m-p/455831 we see that the IMX6 PCIe driver cannot support prefetchable memory regions of more than 16MBytes in the

Is this limitation still in place and applicable to the IMX8M Plus PCIe as well?

Thanks.

Re: iMX8M Plus PCIe prefetchable memory

Yuri — Fri, 03 Sep 2021 05:13:45 GMT

@kentmeyer
Hello,

According to section 2.2 (Cortex-A53 Memory Map) of i.MX 8M Plus
Reference Manual (Rev. 1, 06/2021) the following memory address
area of 128MB is located for the PCIe: 1800_0000 - 1FFF_FFFF

Under Linux:
— PCIe host configuration space: 0x33c0_0000 – 0x33ff_ffff (4Mbytes)
— PCIe device configuration space: 0x27f0_0000 – 0x27f7_ffff (512K bytes)
— PCIe IO space: 0x27f8_0000 – 0x27f8_ffff (64K bytes)
— PCIe memory space: 0x2000_0000 – 0x27ef_ffff (127M bytes)

Regards,
Yuri.

topic iMX8M Plus PCIe prefetchable memory in i.MX Processors

iMX8M Plus PCIe prefetchable memory

Re: iMX8M Plus PCIe prefetchable memory