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

[Gerardo Exequiel Pozzi]

  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.

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