Kernel panic (unable to mount rootfs on unknown block 0,0)

[yaslam]

Hi! I recently tried to manually setup a kernel following the handbook and I have been having some issues.

When I start the system from the manually setup kernel, it boots and then it says "Loading Linux (VERSION)" and Caps Lock starts blinking.

I have already found multiple forums posts here and on Reddit which have all mostly suggested setting CONFIG_FB, CONFIG_FB_EFI, CONFIG_FB_VGA etc.. which I have done.

I also have set the options to enable the I915 framebuffer drivers.

I thought the issue was with me not setting the required option for my EMMC storage on the laptop. I set that and the same Caps Lock blinking issue occurred.

Also I followed all the steps in the Handbook section "Configuring the kernel", the Intel article, Gentoo Kernel Configuration Guide, and the Framebuffer article.

I do not know what the issue is at this point, right now I am using a distribution kernel which I don't mind using but I would like to be able to get a manually configured kernel working.

I used make menuconfig to select the options.

This is my kernel config: https://hastebin.skyra.pw/hedidusewu.ini
This is lspci: https://hastebin.skyra.pw/epuyiteyiw.yaml
This is lsmod from the distribution kernel: https://hastebin.skyra.pw/epeveyadoc.css
This is lsusb: https://hastebin.skyra.pw/ixijefaciw.yaml

Laptop Specs:
Name: Ideapad 120S-14iAP
Processor: Intel(R) Pentium(R) CPU N4200 @ 1.10GHz
Graphics: Intel Corporation Apollo Lake [HD Graphics 505]
Memory: 4GB
Storage: 64GB EMMC (Realtek Semiconductor Co., Ltd. RTS5229 PCI Express Card Reader)
Network: Intel Corporation Dual Band Wireless-AC 3165 Plus Bluetooth


Thank you!

[yaslam]

So I managed to fix the blank screen by setting CONFIG_FRAMEBUFFER_CONSOLE to yes, I now know why the kernel panic is happening.
It is saying: "unable to mount rootfs on unknown block (0,0)"

[pietinger]

yaslam,

Welcome To Gentoo Forums !

You are surely missing a module so kernel is able to reach its root partition. We have a good post here:
https://forums.gentoo.org/viewtopic-p-8688524.html#8688524

Have also a look into: https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_Configuring_Kernel_Version_6.6#Part_3_-_Must_Haves

(or start at the beginning here: https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration )
_________________
https://wiki.gentoo.org/wiki/User:Pietinger

[pietinger]

P.S.: A quick look to your config shows me a missing # CONFIG_X86_INTEL_LPSS is not set

(This module powers on in many Intel notebooks other system components; maybe this is the only missing setting, but please check the complete https://wiki.gentoo.org/wiki/User:Pietinger/Tutorials/Manual_kernel_configuration )
_________________
https://wiki.gentoo.org/wiki/User:Pietinger

[yaslam]

[yaslam]

So I've been looking at the links and I also enabled LPSS but I cannot get it to work. It still says unable to mount rootfs on unknown block (0,0).

I have triple checked checked my options and they seem correct from looking at those links. I do not know why it doesn't work.

I believe I will stick with the distribution kernel as it just works and I just cannot get the manually configured kernel to work.

Kernel config: https://hastebin.skyra.pw/wogumewova.ini

[yaslam]

Or I might start over and redo the kernel configuration with one that already boots.

[grknight]

[yaslam]

[yaslam]

Fantastic stuff

[pietinger]

[yaslam]