[arch-releng] archiso boot fail from cdrom (Was [PATCH 1/3] [syslinux-iso] ....

[Gerardo Exequiel Pozzi]

  On 06/26/2010 06:41 PM, Gerardo Exequiel Pozzi wrote:
>  On 06/26/2010 06:03 PM, Gerardo Exequiel Pozzi wrote:
>>  On 06/26/2010 05:22 PM, Thomas Bächler wrote:
>>> I cannot boot the image via CD. udev does not create /dev/disk/ 
>>> symlinks
>>> for CD devices (any more?). That's why we had the archiso_early hook in
>>> the first place. How did you make yours boot? We need an extra udev 
>>> rule
>>> for this to work as far as I can see, otherwise udev won't scan CDs.
>>>
>>> memdisk works fine though.
>>>
>>
>> oops, only tested booting as disk. Yes, booting as cdrom fails.
>>
>> The issue is that 60-persistent-storage.rules that does not match 
>> cdrom devices like in previous version of udev, so blkid is not 
>> executed.
>> The problem is on cdrom_id helper program, is does not dump some data 
>> for udev rules ( ID_CDROM_MEDIA_SESSION_NEXT=, 
>> ID_CDROM_MEDIA_SESSION_COUNT=, ID_CDROM_MEDIA_TRACK_COUNT=
>> ID_CDROM_MEDIA_TRACK_COUNT_DATA= )
>>
>>
> I tested on real machine and booting from cdrom works OK.
And also tested under Virtualbox and also works fine booting from cdrom 
(iso).
So if you testwas on qemu, I guess that something is wrong with new 
cdrom_id (there are several changes) and qemu.

http://git.kernel.org/?p=linux/hotplug/udev.git;a=history;f=extras/cdrom_id/cdrom_id.c
>
> Some tests:
>
> 1) boot current instllation media
> 2) /lib/udev/cdrom_id --debug /dev/sr0  and works OK
> 3) update to latest udev
> 4) execute (2) then FAIL
>
> # /lib/udev/cdrom_id --debug /dev/sr0
> main: probing: '/dev/sr0'
> cd_inquiry: INQUIRY: [QEMU    ][QEMU DVD-ROM    ][0.12]
> cd_profiles: GET CONFIGURATION: size of features buffer 0x0010
> cd_profiles: GET CONFIGURATION: feature 'profiles', with 2 entries
> feature_profiles: profile 0x10 dvd_rom
> feature_profiles: profile 0x08 cd_rom
> cd_profiles: current profile 0x08
> cd_profiles: profile 0x08 media_cd_rom
> info_scsi_cmd_err: READ DISC INFORMATION failed with 
> SK=5h/ASC=20h/ACQ=00h
> ID_CDROM=1
> ID_CDROM_CD=1
> ID_CDROM_DVD=1
> ID_CDROM_MRW=1
> ID_CDROM_MRW_W=1
> ID_CDROM_MEDIA=1
> ID_CDROM_MEDIA_CD=1
>
>
> This is how looks correctly
> # /lib/udev/cdrom_id --debug /dev/sr0
> main: probing: '/dev/sr0'
> cd_inquiry: INQUIRY: [QEMU    ][QEMU DVD-ROM    ][0.12]
> cd_profiles: GET CONFIGURATION: number of profiles 20
> cd_profiles: current profile 0x08
> cd_media_toc: READ TOC: len: 20
> cd_media_toc: track=1 info=0x4(data) start_block=0
> cd_media_toc: last track 1 starts at block 0
> cd_media_info: disk type d8
> ID_CDROM=1
> ID_CDROM_MRW=1
> ID_CDROM_MRW_W=1
> ID_CDROM_MEDIA=1
> ID_CDROM_MEDIA_CD=1
> ID_CDROM_MEDIA_SESSION_NEXT=38876
> ID_CDROM_MEDIA_SESSION_COUNT=15884
> ID_CDROM_MEDIA_TRACK_COUNT=48900
> ID_CDROM_MEDIA_TRACK_COUNT_DATA=1
>


-- 
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1