Trouble booting basic x86 image

Trouble booting basic x86 image

[Paul D. DeRocco]

Yocto Gatesgarth, using meta-intel to build core-image-minimal
Intel D2700MUD mini-ITX mobo with D2700 Atom
Ordinary USB 2.0 flash drive

I followed the instructions in the meta-intel README, and had no problems
building the intel-core2-32 and intel-corei7-64 machines, as well as the
latter with an x32 tune. But whenever I try to boot any of them, I get the
following stuff from the kernel:

usb 1-6: new high-speed USB device number 4 using ehci-pci
usb-storage 1-6:1.0: USB Mass Storage device detected
usb-storage 1-6:1.0:  Quirks match for vid 090c pid 1000: 400
scsi host4: usb-storage 1-6:1.0
scsi 4:0:0:0: Direct-Access     FLASH    Drive SM_USB20   1100 PQ: 0 ANSI: 4
sd 4:0:0:0: Attached scsi generic sg0 type 0
sd 4:0:0:0: [sda] 3932160 512-byte logical blocks: (2.01 GB/1.88 GiB)
sd 4:0:0:0: [sda] Write Protect is off
sd 4:0:0:0: [sda] No Caching mode page found
sd 4:0:0:0: [sda] Assume drive cache: write through
 sda:
sd 4:0:0:0: [sda] Attached SCSI removable disk
(countdown from 27 to 0)
Mounted filesystems
Available block devices
major minor  #blocks  name
   1        0       4096 ram0
    ... (others edited out)
   1       15       4096 ram15
   8        0    1966080 sda
Cannot find rootfs.img file in /run/media/* , dropping to a shell

At this point, it doesn't drop to a shell, but just sits there, responding
to keys by echoing them, so I have no way of investigating. Ctrl-Alt-Del
reboots.

Since there is no kernel serial output on this board, even though the kernel
command requests it, I videoed the startup, but didn't anything that looked
suspicious. I didn't see any message, though, about mounting anything in
/run/media.

As I've said, I've tried three different builds, totally generic except for
using the Intel BSP layer. I've tried two different USB drives. I've tried
it with EFI enabled and disabled in the BIOS. I've looked at the drive on
the PC, and the contents look normal. So why can't it find the rootfs.img
file, which is right there on sda, large as life? Anyone have any ideas what
I could be doing wrong?

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com
 

Re: [yocto] Trouble booting basic x86 image

[Anuj Mittal]

On Tue, 2021-02-23 at 01:01 -0800, Paul D. DeRocco wrote:
> Yocto Gatesgarth, using meta-intel to build core-image-minimal
> Intel D2700MUD mini-ITX mobo with D2700 Atom
> Ordinary USB 2.0 flash drive
> 
> I followed the instructions in the meta-intel README, and had no
> problems
> building the intel-core2-32 and intel-corei7-64 machines, as well as
> the
> latter with an x32 tune. But whenever I try to boot any of them, I
> get the
> following stuff from the kernel:
> 
> usb 1-6: new high-speed USB device number 4 using ehci-pci
> usb-storage 1-6:1.0: USB Mass Storage device detected
> usb-storage 1-6:1.0:  Quirks match for vid 090c pid 1000: 400
> scsi host4: usb-storage 1-6:1.0
> scsi 4:0:0:0: Direct-Access     FLASH    Drive SM_USB20   1100 PQ: 0
> ANSI: 4
> sd 4:0:0:0: Attached scsi generic sg0 type 0
> sd 4:0:0:0: [sda] 3932160 512-byte logical blocks: (2.01 GB/1.88 GiB)
> sd 4:0:0:0: [sda] Write Protect is off
> sd 4:0:0:0: [sda] No Caching mode page found
> sd 4:0:0:0: [sda] Assume drive cache: write through
>  sda:
> sd 4:0:0:0: [sda] Attached SCSI removable disk
> (countdown from 27 to 0)
> Mounted filesystems
> Available block devices
> major minor  #blocks  name
>    1        0       4096 ram0
>     ... (others edited out)
>    1       15       4096 ram15
>    8        0    1966080 sda
> Cannot find rootfs.img file in /run/media/* , dropping to a shell

It looks like you are using the live option in hddimg image? Can you
try adding "rootwait" to kernel parameters and see if that works?

Not sure why it's not dropping to shell, but may be try adding explicit
call to /bin/sh in meta/recipes-core/initrdscripts/files/init-live.sh
before this point to make sure the media is actually mounted at that
point.

Also, have you tried wic image to see if that works?

Thanks,

Anuj

Re: [yocto] Trouble booting basic x86 image

[Paul D. DeRocco]

> From: Mittal, Anuj [mailto:anuj.mittal@intel.com] 
> 
> It looks like you are using the live option in hddimg image? Can you
> try adding "rootwait" to kernel parameters and see if that works?
> 
> Not sure why it's not dropping to shell, but may be try 
> adding explicit
> call to /bin/sh in meta/recipes-core/initrdscripts/files/init-live.sh
> before this point to make sure the media is actually mounted at that
> point.
> 
> Also, have you tried wic image to see if that works?

Thanks for the advice. I decided to try wic, since that's actually the x86
default if you don't set IMAGE_FSTYPES. It also looks cleaner than hddimg,
since it has a real ext4 partition and no loop mounting.

For the 32-bit build, it produced something my BIOS wouldn't recognize as
bootable, even though it looked fine in gparted. For the 64-bit build, it
booted part way, crashing on an illegal instruction in systemd. For the
64x32-build, it booted but failed trying to run /sbin/init with error -8
(invalid executable). When I look at the drive in Ubuntu, the properties on
that file say it's a link to /lib/systemd/systemd, which makes sense.
Strangely, though, it describes it as a shared library. objdump -f says:

/media/pauld/platform/sbin/init:     file format elf32-x86-64
architecture: i386:x64-32, flags 0x00000150:
HAS_SYMS, DYNAMIC, D_PAGED
start address 0x00024490

So still no joy. I'd rather get this wic version working than go back to the
hddimg version, but I'm not sure what to try next.

Ultimately, I'm just trying to get a vanilla reference build, so that when
the "real" system I'm creating doesn't work (which is often), I can compare
kernel configs, etc., to a known working system.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com