[SOLVED] RasPi not booting after firmware update

[Bobyl]

Hi,

Since firmware update 20121017, I was unable to boot my RasPi. Plugging it gave an immediate kernel panic:

$this->bbcode_second_pass_code('', '
Kernel Panic: VFS : Unable to mount root fs on unknown-block (0,0)
')

After a lot of testing (changing the PSU, trying another SD card, testing my SD on another Pi, unplugging evrything - except HDMI and PSU of course), I finally have found the culprit:
I had to remove this option:

$this->bbcode_second_pass_code('', '
sdhci-bcm2708.sync_after_dma=0
')

from cmdline.txt

My Pi seems to be happily running without this option since this morning but I have 3 questions:
1. What is the use of this option?
2. Would another value of sdhci-bcm2708.sync_after_dma allow to boot the Pi without a kernel panic?
2. Now that it has been removed, should I expect to run into issues?

[pepedog]

The kernel source is constantly changing, I have to look in several places there, and the rpi forum to decide what to do.
I have asked for "recommend" cmdline and config txt files to be posted, would make life easier
Without even looking I can tell you it's safe to leave it out.
Thanks for the info

[ezyclie]

I got same issue but this time with sdhci-bcm2708.cycle_delay=1000

[vfbsilva]

$this->bbcode_second_pass_quote('Bobyl', 'H')i,

Since firmware update 20121017, I was unable to boot my RasPi. Plugging it gave an immediate kernel panic:

$this->bbcode_second_pass_code('', '
Kernel Panic: VFS : Unable to mount root fs on unknown-block (0,0)
')

After a lot of testing (changing the PSU, trying another SD card, testing my SD on another Pi, unplugging evrything - except HDMI and PSU of course), I finally have found the culprit:
I had to remove this option:

$this->bbcode_second_pass_code('', '
sdhci-bcm2708.sync_after_dma=0
')

from cmdline.txt

My Pi seems to be happily running without this option since this morning but I have 3 questions:
1. What is the use of this option?
2. Would another value of sdhci-bcm2708.sync_after_dma allow to boot the Pi without a kernel panic?
2. Now that it has been removed, should I expect to run into issues?

[Mauron]

I haven't that option, still my Pi doesn't even boot.

[Magikarp]

Happened to me, too. After removing sdhci-bcm2708.cycle_delay=1000 it doesn't panic.

[Mauron]

I've got this in my command line file:
$this->bbcode_second_pass_code('', 'dwc_otg.dma_enable=1 dwc_otg.dma_burst_size=256 dwc_otg.lpm_enable=0 dwc_otg.dma_enable=1 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 loglevel=3 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait')
My Pi doesn't boot, red light stands still as if no card were inserted, however the SD card surely does work.

Edit: somehow I managed to make it boot again by manually updating the firmware from here.

[pepedog]

That got you out of trouble, mauron, but if there was something seriously wrong with the firmware it would be inundated with posts here, plus you stepped out of arch.
When you updated via pacman, did you sync before reboot? Only asking so it helps in general.

$this->bbcode_second_pass_quote('pepedog', 'T')hat got you out of trouble, mauron, but if there was something seriously wrong with the firmware it would be inundated with posts here, plus you stepped out of arch.

[pepedog]

No, you didn't go out of topic, nothing to be sorry about.
Looks like your actual problem is nothing to do with the packaged firmware or kernel though. There could be a million reasons why you got a freeze at that point.