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 Forum index » Advanced Topics » Cutting edge
Booting Live CD (2.17 experimental) from a USB Drive
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grndoor

Joined: 17 Oct 2006
Posts: 19

PostPosted: Fri 06 Jul 2007, 08:22    Post_subject:  Booting Live CD (2.17 experimental) from a USB Drive  

I have a Laptop with an internal CD drive which is faulty.

I therefore boot the Puppy Live CD from an external USB Drive which shows up on /dev/sr0.

With the Puppy 2.16/2.16.1 Live CD I have to use the "pmedia=usb" or "pmedia=usbcd" boot parameter to force a boot from the external USB CD Drive.

With the 2.17 Experimental Live CD this method no longer works and the boot process fails with an error message:

"ERROR, cannot find Puppy on 'usbcd' boot media"

Doing a "diff" on the 216 and 217 "init" files includes:

929c944,946
< [ ! "`test-scsi | grep '/scd'`" = "" ] && PMEDIA='satacd'
---
> #[ ! "`test-scsi | grep -E '/scd|/sr'`" = "" ] && PMEDIA='satacd' #v2.17 added sr
> #[ "`grep -E ' scd| sr' /proc/diskstats`" != "" ] && PMEDIA='satacd' #v2.17
> [ "`ls -1 /sys/block | grep -E '^scd|^sr'`" != "" ] && PMEDIA='satacd' #v2.17

Running the above 217 "init" command:

"ls -1 /sys/block | grep -E '^scd|^sr'"

from the command line left after the failed 217 boot, produces "sr0".

The USB CD Drive is therefore being partially recognised.
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