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12 Posts

06-27-2012

San Francisco

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Debugging W520 UEFI boot

2013-10-19, 17:11 PM

 

I have been having trouble with UEFI boot on my W520 (Model 4270CTO) with the latest bios update (1.42).  I run linux and I have been interested in finding out if my laptop supports secure boot.  So I have an xubuntu boot install CD and I have verified that it boots fine in UEFI mode on another computer.  I simply put the cd in the drive, tell the computer to boot from the cd and it works.  I know that it is booting in UEFI on this computer because, as described in the documentation that comes with the cd,

  1. the boot sequence is different in the UEFI boot sequence than it is in the legacy boot mode.
  2. there is a efivars directory in /proc that is present in UEFI boot mode but not with the legacy boot mode.

But when I try to boot the cd in UEFI mode on the W520 by disabling the legacy mode in the bios, the boot sequence fails.  I have seen the grub menu, and I would think that if I got that far everything was good.  But boot seems to fail reading the cd. There is a kernel panic "Unable to mount root fs on unknown block(0,0)".  There is another error message that sometimes comes up that seems to involve reading the cd, but I can't reproduce this until Monday.

 

Has anyone succeeded with a linux UEFI boot on the W520?  Does it make a difference if Windows is not present?

 

-Timothy

 

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525 Posts

03-11-2009

Chicago, IL

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Re: Debugging W520 UEFI boot

2013-10-20, 13:43 PM

W520 is not UEFI 2.2. No secure boot.

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525 Posts

03-11-2009

Chicago, IL

300 Signins

14180 Page Views

  • Posts: 525
  • Registered: ‎03-11-2009
  • Location: Chicago, IL
  • Views: 14180
  • Message 2 of 4

Re: Debugging W520 UEFI boot

2013-10-20, 13:43 PM

W520 is not UEFI 2.2. No secure boot.

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12 Posts

06-27-2012

San Francisco

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  • Posts: 12
  • Registered: ‎06-27-2012
  • Location: San Francisco
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Re: Debugging W520 UEFI boot

2013-10-20, 16:12 PM

 

Thanks!  I wasn't expecting that answer but it makes sense.  That is I couldn't figure out how to turn secure boot on and off in the bios.

 

-Timothy

 

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20 Posts

10-04-2011

United States of America

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Re: Debugging W520 UEFI boot

2014-01-31, 9:56 AM

I'm guessing "Secure Boot" is supported in UEFI >= 2.2 ?  So, that means W520 users should not bother with UEFI (Linux)? The kernel panic was caused by "trying to mount unknown block (0,0)"; so, apparently kernel chocked after trying to mount the persistent memory that saves the Lenovo UEFI/Bios?

 

I apologize for rambling, I'm trying to understand this issue a little better and the "accepted solution" is somewhat unclear.  Thanks for any and all help.

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