brcmfmac.ko is undefined when executing make

[Urb1101]

in Raspberrypi 4B, I executed make in patches/bcm43455c0/7_45_234_4ca95bb_CY/nexmon. but got error: BUILDING DRIVER for kernel 5.10 brcmfmac_5.10.y-nexmon/brcmfmac.ko (details: log/driver.log) ERROR: modpost: "brcmf_dmi_probe" [～/nexmon/patches/driver/brcmfmac_5.10.y-nexmon/brcmfmac.ko] undefined!

kernel version:5.10.71-v8+ is there a way to solve this?

[jlinktu]

Probably similar to #600 ; try the solution proposed there.

[Urb1101]

rpi-source dosent work? in #600 Its recommanded to use manual download but I used rpi-source to download kernel header.

[Urb1101]

I tried #600 solution but it also didnt worked, is there other way to solve?

[pH-Valiu]

I have the same error, only for kernel version 5.10.92-v8+ and bcm43455c0/7_45_189 I got rpi-source to work, still brcmf_dmi_probe is undefined or not available. Has anyone found a solution for it?

[pH-Valiu]

I might have found the error 🐡

[Urb1101]

~~hello, I couldn't solve this problem but pre-complied version worked and im using it now.~~ ~~(https://github.com/nexmonster/nexmon_csi_bin)~~ ~~i hope it work for you!~~

[pH-Valiu]

But don't they only work for 32 bit?

[jlinktu]

We do not provide any precompiled / prepatched firmware and also advice against using those. You should always generate your own patched firmware.

[pH-Valiu]

I might have found the error 🐡

I managed to get nexmon_csi (and nexmon) compiled on ARM64 (5.10.92-v8+) by following the following steps: Mostly follow the compilation guide for 64bit in the nexmon README. Additionally, if you want nexmon_csi, take this issues` comments as help: https://github.com/seemoo-lab/nexmon_csi/issues/364 Then:

• Including dmi.o into the target files of the Makefile of the driver package (brcmfmac_5.10.y-nexmon/Makefile) (in nexmon_csi/ and/or nexmon/patches/driver respectively).
• Removing the checks for architecture in the nexmon_csi/Makefile at lines 116 and lines 340
• The fix with rpi-source at issue #600 proved to be correct, though manually downloading the files did not do it, rather invoking rpi-source, waiting for it to fail, making sure to have installed libssl-dev and bc (and xxd, will be needed further down the road). Then call:

make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- bcm2711_defconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- modules_prepare

(I defaulted all configs of the kernel headers)
and make sure that /lib/modules/5.10.92-v8+/build links to the liunx headers directory (e.g. /home/pi/linux-headers or /root/liunx-headers depending on where you installed them)

• And then in the end, compiling nexmon (or nexmon_csi) by calling first make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- (if possible) and then make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- install-firmware

[Urb1101]

sorry I didnt know precompiled version isnt recommended. and thank you for presenting way to solve. I will try to compile again.