/lib/Modules.symvers missing

[sploders101]

First off, I want to thank you for all the work you've put into this kernel module! However, I can't get it to work. I am currently trying to experiment with modding Symphonisk speakers, which use NAND flash as their boot medium. Unfortunately, there don't appear to be very detailed instructions on your gh-pages. I cloned the kernel, compiled it, and ran your scripts, but can't get it to work. The Modules.symvers file referenced by the nand script doesn't exist, and I can't find reference to the nand module in the one that does. Any help would be greatly appreciated. Thanks!

[TheCrazyT]

@sploders101
I guess its because I compiled the whole kernel before that.

According to: https://unix.stackexchange.com/questions/24704/how-to-generate-module-symvers
You need to do atleast "make modules" first.
Also keep in mind that the current bash-scripts are intented to be executed directly on the Raspberry-PI.
But because of that it takes alot of time to be honest.

It might also be possible to cross compile it, but I can't remember if I ever did anything like that.

[TheCrazyT]

Oh well ... about cross compiling, just take a look at:
https://github.com/TheCrazyT/linux/blob/317767aca31a5a2cbc9aec75481898b5e4a6e48f/.github/workflows/main.yml

Didn't remember that I actually created that file for github "Actions" to actually cross compile the libraries.
(You can not execute the main.yml directly but atleast see the commands you might need to use)
To be honest I never tested the result libraries there, it was just for testing.

The config file used there is also restricted to the hardware used.
But I guess the main.yml might be help a bit incase you do not want to wait for long builds on the raspberrypi.

[sploders101]

I compiled the kernel as documented here: https://www.raspberrypi.org/documentation/computers/linux_kernel.html

Unfortunately, I still did not get the symvers file. However, I see in the yml file you're downloading a .config file from a gist. It may be possible that I did not choose my options correctly when compiling (the mtd section in menuconfig seems to be kind of a mess). When I get home, I may try that config and see if it generates the expected results. Might I ask what options you chose and/or which pi that config is for?

I did find the latest version of the OS containing the driver by default though (https://downloads.raspberrypi.org/raspios_full_armhf/images/raspios_full_armhf-2020-05-28), and I'm downloading that to try. I'm a little familiar with the MTD subsystem as I had to manage it some for an embedded system at work, but I have no idea how it actually works on the hardware or kernel levels. I will likely circle back around to figure out how to make this work in the near future.

Thanks for the quick response!

[TheCrazyT]

The config was for "RaspberryPI 3 Model B". (so its probably based on "bcm2709_defconfig")

[sploders101]

Awesome, thanks! Trying this out today. I have one of those sitting next to me, and I was able to get linux to detect my flash using older OS images, but then it would report a bug in the mtd driver and stop. Hoping your patches yield better results.