Ubuntu arm pcie driver doesn't load RM520 with R03 firmware

IoT Modules 5G Module
,
1

I’ve recently got a new RM520NGLAA-M20-SGASA with RM520NGLAAR03A03M4G
I put it in a Khadas VIM4.
The pcie driver does not load correctly - I only see 1 mhi_device
/dev/mhi_BHI
And no
/dev/mhi_LOOPBACK , /dev/mhi_DUN /dev/mhi_MBIM etc

When I replace the device with one running older firmware I see all the mhi_ devices.

I notice that dmesg contains this:

[ 43.907416] mhi_init Quectel_Linux_PCIE_MHI_Driver_V1.3.7
[ 43.908037] Failed to set up IOMMU for device 0000:01:00.0; retaining platform DMA ops
[ 43.908078] mhi_pci_probe pci_dev->name = 0000:01:00.0, domain=0, bus=1, slot=0, vendor=17CB, device=0308

Can you please tell me what the problem might be - I can go back to the board maker if needed…

I need to use the newer firmware to access e-sim features.

Here are some logs for r01 and r03 firmware…

r01dmesg.txt (6.2 KB)
r03dmesg.txt (5.0 KB)

2

Dear @steely-glint
Could you confirm the modem worked before? From log, mhi_power_up is abnomal.

image
image1673×719 82.4 KB

3

@silvia

Hi,

The R01 modem works in both pcie mode and usb mode
The R03 modem only works in usb mode

2 different modems tested in the same hardware. (Khadas VIM4 running Ubuntu)

(We have several devices running the R01 firmware in pcie mode)

Hope that helps -

Thanks.

Tim.

4

Dear @steely-glint
So did you change module to PCIe mode? And use the latest version of driver?

5

@silvia Hi,
I’m using

Quectel_Linux_PCIE_MHI_Driver_V1.3.7

I think that is the latest driver.

I set

AT+QCFG=“data_interface”,1,0

Then power cycled - It sees the device with lspci - and creates /dev/mhi_BHI but not the other devices.

Are there any other tests I can do to help debug?

Thanks.

Tim.