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Troubleshooting • lots of brcmfmac errors such as "brcmfmac: brcmf_sdio_isr: failed backplane access"

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Hi,
I'm running

Code:

Linux version 6.12.47+rpt-rpi-v8 (serge@raspberrypi.com) (aarch64-linux-gnu-gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #1 SMP PREEMPT Debian 1:6.12.47-1+rpt1~bookworm (2025-09-16)
on a

Code:

Raspberry Pi Zero 2 W Rev 1.0(ssc-3.13.5)
The image was download using Raspberry Pi Manager. I have made the device an AP and installed the Seestar_ALP.
I have also done a apt update and upgrade so I should have the latest everything.

I'm having WiFi and possibly sd card reliability issues.

It will run happily sat on a desk doing "nothing" for days.
When I run an overnight app (in this case seestar_alp) problems start after a few hours and eventually the I loose communication over WiFi. If I plug in an ethernet cable (vis usb converter) I can see the PiZ2W is running.
Having looked around the web there are lots of post regarding the mmc1 controller but I can't find a concrete solution. There seem to be a few from a couple of years ago mentioning firmware but nothing new and as far as I understand the PiZ2W does not have firmware. I believe that it's the Pi4s and 5s that do.

Looking through journalctl I get errors such as:

Code:

Dec 17 03:38:29 S30ALP kernel: mmc1: Controller never released inhibit bit(s).Dec 17 03:38:29 S30ALP kernel: brcmfmac: mmc_submit_one: CMD53 sg block read failed -5Dec 17 03:38:29 S30ALP kernel: brcmfmac: brcmf_sdio_rxglom: glom read of 6656 bytes failed: -5Dec 17 03:38:29 S30ALP kernel: brcmfmac: brcmf_sdio_rxfail: abort command, terminate frame

Code:

Dec 17 00:37:40 S30ALP kernel: mmc1: Controller never released inhibit bit(s).Dec 17 00:37:40 S30ALP kernel: brcmfmac: brcmf_sdio_isr: failed backplane accessDec 17 00:37:40 S30ALP kernel: brcmfmac: brcmf_sdio_hdparse: HW header checksum errorDec 17 00:37:40 S30ALP kernel: brcmfmac: brcmf_sdio_rxfail: terminate frameDec 17 00:37:40 S30ALP kernel: brcmfmac: brcmf_sdio_rxfail: abort command, terminate frame
and sometimes a block of

Code:

Dec 17 03:54:20 S30ALP kernel: ieee80211 phy0: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110Dec 17 03:54:23 S30ALP kernel: ieee80211 phy0: brcmf_proto_bcdc_query_dcmd: brcmf_proto_bcdc_msg failed w/status -110Dec 17 03:54:23 S30ALP kernel: ieee80211 phy0: brcmf_cfg80211_get_station: GET STA INFO failed, -110
Here's a link to journalctl from the last few days..
https://hidrive.ionos.com/lnk/Bk3maUPrx
I have restarted it using power down and some times sudo reboot now.

I have measure the voltage on the Pi and it was 5.01V. It may have not been loaded at the time.

I added

Code:

over_voltage=2
to config.txt and I though it had made a difference but then I found similar errors later.

Could some one help me find the issue.
It seems to be around the brcmf device.

Many thanks
Andy

Statistics: Posted by AndyNC — Wed Dec 17, 2025 4:40 pm



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