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The yaboot.conf file is able to boot different resolutions when you configure it the right way. It is very handy when you own an SDTV and run it in 480i and then go to your friend's house who has an HDTV and want to run it in 720p. I think this will work for YDL 5 and 6, but this is for the people that run YDL 6.

1) Open up a terminal and open up the yaboot.conf file:
Code:
su
 
password:
 
gedit /etc/yaboot.conf
2) A regular yaboot.conf file would look like this with the video number varying:
Code:
# yaboot.conf generated by anaconda
 
boot=/dev/ps3da
init-message=Welcome to YDL!\nHit <TAB> for boot
options
 
partition=1
timeout=80
install=/usr/lib/yaboot/yaboot
delay=5
enablecdboot
enableofboot
enablenetboot
nonvram
mntpoint=/boot/yaboot
usemount
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=linux
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:1 rhgb quiet root=LABEL=/1"
What I essencially did was copy and paste this part over 4 times, change the video number only and rename it:
Code:
image=/vmlinux-2.6.23-9.ydl6.1
    label=linux
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:1 rhgb quiet root=LABEL=/1"
So for 480i I named it YDL480i and set the video number to 1. I made one for 720p naming it YDL720p and changing the video number to 3. I did the same thing for the other resolutions too.

Now here is how my file looks like after configuring:
Code:
# yaboot.conf generated by anaconda
 
boot=/dev/ps3da
init-message=Welcome to YDL!\nHit <TAB> for boot
options
 
partition=1
timeout=80
install=/usr/lib/yaboot/yaboot
delay=5
enablecdboot
enableofboot
enablenetboot
nonvram
mntpoint=/boot/yaboot
usemount
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=YDL480i
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:1 rhgb quiet root=LABEL=/1"
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=YDL480p
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:2 rhgb quiet root=LABEL=/1"
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=YDL720p
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:131 rhgb quiet
root=LABEL=/1"
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=YDL1080i
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:4 rhgb quiet root=LABEL=/1"
 
image=/vmlinux-2.6.23-9.ydl6.1
    label=YDL1080p
    read-only
    initrd=/initrd-2.6.23-9.ydl6.1.img
    append="video=ps3fb:mode:5 rhgb quiet root=LABEL=/1"
Note: DO NOT copy and paste this and put it in your file! On my install I did not accept the default options for the partition table which for some reason changes the yaboot.conf meaning that mine is different from everybody elses. So just copy and paste your own text.

Save, reboot, and if you did it right, at the kboot prompt, you can tab through the options you have just made for the different resolutions.