Cannot build initramfs on Pinebook Pro with 5.15.74 kernel

[CameronNemo]

Hello, I am trying to use Booster on an aarch64 system, the rk3399-based Pinebook Pro, which is running a near-mainline kernel (the small number of patches are here).

I am getting this error:

2022/10/16 10:52:22 key arm_cci maps to multiple values (kernel/drivers/bus/arm-cci.ko,kernel/drivers/perf/arm-cci.ko)

I see this in my modules directory:

/usr/lib/modules/5.15.74_1/modules.builtin
141:kernel/drivers/bus/arm-cci.ko
588:kernel/drivers/perf/arm-cci.ko

Any tips on how to get this working? Do you need more information?

[anatol]

Booster generator finds 2 modules with the same name and it gets confused about which one to use.

Do you know how modprobe and other tools pick the right module at your system?

[CameronNemo]

Aren't these builtin modules? So I do not really know, as I cannot try it. Or at least nothing related shows up in lsmod and modprobe seems to do nothing after finding it in modules.builtin.bin

[CameronNemo]

I don't think the bus support can be compiled as module, only the perf support. I don't really know, sorry. This is what is says in drivers/perf/Kconfig:

config ARM_CCI_PMU
	tristate "ARM CCI PMU driver"
	depends on (ARM && CPU_V7) || ARM64
	select ARM_CCI
	help
	 Support for PMU events monitoring on the ARM CCI (Cache Coherent
	 Interconnect) family of products.

	 If compiled as a module, it will be called arm-cci.

[anatol]

The kernel module dependency resolution is one of the weirdest things in linux kernel build system.

What I can do it to try to downgrade it from failure to a warning. booster build will report that there are several modules with the same name and continue image assembly. Hopefully, it will help with the situation.

[anatol]

@CameronNemo I pushed a possible fix to wip branch. Please try it and let me know if it makes any difference to you.