Tiny Core Linux

Tiny Core Base => Raspberry Pi => Topic started by: mortegai on January 20, 2023, 07:54:53 AM

Title: kmod for new kernel versions
Post by: mortegai on January 20, 2023, 07:54:53 AM

Since Oct-2022 in newer kernel versions (5.15.y and later), the vc4 module (Broadcom VC4 Graphics Driver) has a softdep of snd-soc-hdmi-codec. 
The Busybox's modutils applets (modprobe, ...) don't deal with these softdeps, which prevents the correct initialization of the vc4 module and this causes the lack of display on the screen. 

Therefore, I think that for the next versions of piCore those Busybox applets should be replaced by kmod.

Title: Re: kmod for new kernel versions
Post by: Juanito on January 20, 2023, 08:33:05 AM

Does “modinfo vc4" show the dep? If not, I don’t think busybox modprobe will load it.

You could also test with modutils modprobe?

Title: Re: kmod for new kernel versions
Post by: mortegai on January 20, 2023, 12:47:16 PM

busybox modinfo vc4

Code: [Select]

filename:       /lib/modules/5.15.84-v8+/kernel/drivers/gpu/drm/vc4/vc4.ko.xz
author:         Eric Anholt <eric@anholt.net>
description:    Broadcom VC4 DRM Driver
license:        GPL v2
parm:           fkms_max_refresh_rate:Max supported refresh rate
parm:           tv_norm:Default TV norm.
Supported: NTSC, NTSC-J, NTSC-443, PAL, PAL-M, PAL-N,
PAL60, SECAM.
Default: PAL if a 50 Hz mode has been set via video=,
NTSC otherwise
alias:          platform:vc4-drm
alias:          of:N*T*Cbrcm,cygnus-vc4C*
alias:          of:N*T*Cbrcm,cygnus-vc4
alias:          of:N*T*Cbrcm,bcm2835-vc4C*
alias:          of:N*T*Cbrcm,bcm2835-vc4
alias:          of:N*T*Cbrcm,bcm2711-vc5C*
alias:          of:N*T*Cbrcm,bcm2711-vc5
srcversion:     9B908D65E2229E5ABCCE5AD
depends:        cec,drm,drm_kms_helper,snd-soc-core
intree:         Y
vermagic:       5.15.84-v8+ SMP preempt mod_unload modversions aarch64
not show the softdeps.
------------------------------------------------
modinfo (kmod)
modinfo vc4

Code: [Select]

filename:       /lib/modules/5.15.84-v8+/kernel/drivers/gpu/drm/vc4/vc4.ko.xz
license:        GPL v2
author:         Eric Anholt <eric@anholt.net>
description:    Broadcom VC4 DRM Driver
softdep:        pre: snd-soc-hdmi-codec
alias:          platform:vc4-drm
srcversion:     9B908D65E2229E5ABCCE5AD
alias:          of:N*T*Cbrcm,cygnus-vc4C*
alias:          of:N*T*Cbrcm,cygnus-vc4
alias:          of:N*T*Cbrcm,bcm2835-vc4C*
alias:          of:N*T*Cbrcm,bcm2835-vc4
alias:          of:N*T*Cbrcm,bcm2711-vc5C*
alias:          of:N*T*Cbrcm,bcm2711-vc5
depends:        cec,drm,drm_kms_helper,snd-soc-core
intree:         Y
name:           vc4
vermagic:       5.15.84-v8+ SMP preempt mod_unload modversions aarch64
parm:           tv_norm:Default TV norm.
Supported: NTSC, NTSC-J, NTSC-443, PAL, PAL-M, PAL-N,
PAL60, SECAM.
Default: PAL if a 50 Hz mode has been set via video=,
NTSC otherwise (charp)
parm:           force_hotplug:int
parm:           fkms_max_refresh_rate:Max supported refresh rate (int)
show the softdeps.
--------------------------------------------------
modutils is quite old and doesn't handle softdeps

Title: Re: kmod for new kernel versions
Post by: Paul_123 on January 24, 2023, 05:40:22 PM

softdeps are only handled by kmod,  but the use case for softdeps is so little, just load the driver yourself.