No file system could mount root

AmigaOne X5000 platform specific issues related to Linux only.

No file system could mount root

Postby kilaueabart » Tue Jul 24, 2018 9:52 pm

I solved my problem where "fatload usb 0:1 1000000 uImage-4.18" couldn't read uImage-4.18 when I was trying to boot Remix. I finally realized it was looking for the file in the same place it got the kernel for MATE 16.04, so I dragged copies of 4.18 and the dtb file over to the partition I have the 16.04 stuff in. Now it reads them just fine. Then "bootm 1000000 - 1c00000" gets a lot of activity, but unfortunately it ends with a Kernel panic, "No file system could mount root" and rebooting in 180 seconds.

I am still able to boot Remix. I start with the command line "set bootargs root=/dev/sdc2" and follow with "run ubuntu," the script I boot 16.04 with. Somehow the setenv bootargs command in that script doesn't overrule the one that set root to /dev/sdc2, and the rest of the script loads the kernel and dtb intended for 16.04. That demonstrates that the Remix .img is still OK. So what could my problem be?
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Re: No file system could mount root

Postby xeno74 » Wed Jul 25, 2018 10:00 am

kilaueabart wrote:I start with the command line "set bootargs root=/dev/sdc2"


You can setup a new start variable for the Remix:

Code: Select all
X5000> setenv remix 'setenv bootargs root=/dev/sdc2 rootdelay=5 ; fatload usb 0:1 1000000 uImage-4.18 ; fatload usb 0:1 2000000 cyrus.dtb ; bootm 1000000 - 2000000'


Code: Select all
saveenv


Boot Remix:

Code: Select all
run remix
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Running Linux on AmigaONEs can require some tinkering.
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Re: No file system could mount root

Postby kilaueabart » Wed Jul 25, 2018 8:19 pm

xeno74 wrote:You can setup a new start variable for the Remix:

Code: Select all
X5000> setenv remix 'setenv bootargs root=/dev/sdc2 rootdelay=5 ; fatload usb 0:1 1000000 uImage-4.18 ; fatload usb 0:1 2000000 cyrus.dtb ; bootm 1000000 - 2000000'


That had occurred to me this morning and I tried it first thing. But I still end up with that Panic: "No file system could mount root ... unknown-block(8, 34)" I rebooted and tried it the way that had worked yesterday, setting root to sdc2, then running "ubuntu." Today that didn't work! Slightly different ending: unknown-block(0, 0). I was very much afraid that straight "run ubuntu" wasn't going to work anymore either. But to my vast relief, here I am.

Wait now! I see a big difference between what I did and what you suggest. Instead of "setenv" I used "editenv," and typed the rest in the new line that came up. And all I have before fatload is "usb reset," which you don't bother with. I'm a bit puzzled.

When I looked at my "ubuntu" script, to copy from, I was surprised to find no mention of bootargs. I'm even more puzzled. How in the world does Uboot know where to find the .img file for MATE 16.04?

AFTER REBOOT I tried another experiment before trying yours. I entered the commands to run 16.04 one by one, instead of "run ubuntu," and I changed the first fatload to load uImage-4.18 instead of uImage-cyrus. I got the same Kernel Panic. Can it be that my download of 4.18 didn't come out right? Could that cause a problem mounting root? I'm going to download it again and see what happens.
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Re: No file system could mount root

Postby kilaueabart » Fri Jul 27, 2018 12:56 am

Weirder and weirder!

The replacement of uImage-4.18 had no effect. I still end up with the same kernel panic. After I unarchive the download, I grab it with cursor and slide it into UBUNTU, which I believe is the desktop equivalent of /dev/sdb2. Is that a bad way to do it? I originally tried cp, but I get "cp: failed to access '/dev/sdc1/': Not a directory". (I'm not really sure about UBUNTU=/dev/sdb2. I also have a mysterious red icon marked "SD" and labeled "2.9 GB Volume" containing the same kernels and .dtb files. How can I find their true identities?)

This morning I experimented, doing a fatload of both of the kernels and both of the .dtb files here and there in RAM. At least that's where I assume they go without harming anything, but maybe I'm wrong on that point. In any event, since then "run ubuntu" no longer works. After a long while the black screen is replaced by a page of text and near the top it says, 'VFS: Cannot open root device "sdc2" on unknown-block(0,0): error -6'.

At the bottom, "Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)".

I am still able to get Remix up, the same old way: setenv bootargs root=/dev/sdc2 rootdelay=5 ; run ubuntu. I can imagine whipping Remix into very usable shape. I find that I can access my 16.04 Home files from Places > MATE. I suppose I could just install the apps I want and copy over the data for them, things like Scribus and GnuCash.
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