Knoppix 6.2 Boot from PXE

[krishnaprasadk]

Hi, Looks like this is a known issue.
https://patchwork.kernel.org/patch/49056/

Does any one if this patch is part of any of the upcoming Knoppix releases?

Thanks,
Krishnaprasad

[krishnaprasadk]

Hi, Please ignore my previous post.

i do see that DEVPATH is the Path under /sys at which this device's sysfs directory can be found. i saw the documentation inside Documentation/firmware_class as well. From there i understood the way kernel is calling the firmware and how it needs to be passed from the user end. per your advise, I've created a script /sbin/hotplug as below:-

#!/bin/sh
echo 1 > /sys/$DEVPATH/loading
cat /lib/firmware/bnx2/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading


Now the firmware is read while loading the module and it fails with an error message as below

firmware 0000:05:00.0: firmware_loading_store: vmap() failed
bnx2: Can't load firmware file "bnx2/bnx2-mips-06-4.6.16.fw"
bnx2: probe of 0000:05:00.0 failed with error -2

I am checking bnx2 driver code on why this failure is seen.

Thanks,
Krishnaprasad

It looks like the issue that i am seeing ( i.e. while loading the bnx2 firmware, vmap() call is failed ) is a known issue. i do see the link as below and it exactly matches the error code that i am seeing.

patchwork.kernel.org/patch/49056/

vmap is called to load the firmware data stored in /lib/firmware/bnx2/$FIRMWARE to the kernel.

Looks like Knoppix is not yet included the fix mentioned in the above link in the kernel that they use. So i compiled ( Changed firmware_class.c in drivers/base ) and created a new bzImage using Live CD but still i face the same error. The error is as below

firmware 0000:05:00.0: firmware_loading_store: vmap() failed
bnx2: Can't load firmware file "bnx2/bnx2-mips-06-4.6.16.fw"
bnx2: probe of 0000:05:00.0 failed with error -2


Any one have faced an error like this? i am blocked my Knoppix Booting via PXE because of this issue .. any help will be highly appreciated !

Thank you all for your time !
- Krishnaprasad

[kl522]

Now the firmware is read while loading the module and it fails with an error message as below

firmware 0000:05:00.0: firmware_loading_store: vmap() failed
bnx2: Can't load firmware file "bnx2/bnx2-mips-06-4.6.16.fw"
bnx2: probe of 0000:05:00.0 failed with error -2

I am checking bnx2 driver code on why this failure is seen.

Thanks,
Krishnaprasad

Try this improved script ( still not the best ) :-

#!/bin/sh
[ -z "$FIRMWARE" ] && exit 
echo 1 > /sys/$DEVPATH/loading
cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading

Please, this is not ***NOT*** a kernel bug or something, this is
an ***EXPECTED*** behaviour.

Cheers.

[kl522]

Let me add one more note to this. Between you and a working system, it's just this shell script, how complicated it can be ?

Please don't look any further and it is not any more complicated than this.

[krishnaprasadk]

Try this improved script ( still not the best ) :-

#!/bin/sh
[ -z "$FIRMWARE" ] && exit 
echo 1 > /sys/$DEVPATH/loading
cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading

Please, this is not ***NOT*** a kernel bug or something, this is
an ***EXPECTED*** behaviour.

Cheers.

Hello,
Sorry if i took a wrong route. I tried the above change that you advised in /sbin/hotplug script, but still bnx2 fails to load the firmware file. I am still seeing the error message:-

firmware_loading_store: vmap() failed

As far as scripting is concerned, no difficulties are there.

since i saw a kernel forum thread which shows the exact error message, i thought of following that. Also in the 6.2 DVD, kernel source is available. There also inside drivers/base, firmware_class.c doesnt have the mutex fix that the forum is suggested to use. so I believed that i am facing the same issue.

Now that the loading of bnx2 firmware still fails with this updated script, could you please advise on how to move forward?

I really appreciate the help that you are providing in this issue !

- Krishnaprasad

[krishnaprasadk]

Try this improved script ( still not the best ) :-

#!/bin/sh
[ -z "$FIRMWARE" ] && exit 
echo 1 > /sys/$DEVPATH/loading
cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading

Please, this is not ***NOT*** a kernel bug or something, this is
an ***EXPECTED*** behaviour.

Cheers.

okay..my mistake.. instead of sending the bnx2 firmware data ( /path/$FIRMWARE ) to /sys/$DEVPATH/data, i was re-directing it to /sys/class/firmware/data.

Now i corrected that and bootup of Knoppix 6.2 from PXE is successful using NFS share... there is not even requited to check if $FIRMWARE exists or not.

Thanks for all your patience in helping me out on this.

Thank you !
Krishnaprasad

[kl522]

Did you notice that the script initially was

cat /lib/firmware/bnx/$FIRMWARE > /sys/class/firmware/data

and the new script was :-

cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data


Did you try to debug the script by changing it to :-

#!/bin/sh
[ -z "$FIRMWARE" ] && exit
echo 1 > /sys/$DEVPATH/loading
echo "Loading firmware /lib/firmware/$FIRMWARE" >> /tmp/log
cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading

Did you check if there are indeed firmware files in your initrd.gz, which filenames are matching what are needed by the script (as appeared in /tmp/log ) ?

[krishnaprasadk]

Did you notice that the script initially was

cat /lib/firmware/bnx/$FIRMWARE > /sys/class/firmware/data

and the new script was :-

cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data


Did you try to debug the script by changing it to :-

#!/bin/sh
[ -z "$FIRMWARE" ] && exit
echo 1 > /sys/$DEVPATH/loading
echo "Loading firmware /lib/firmware/$FIRMWARE" >> /tmp/log
cat /lib/firmware/$FIRMWARE > /sys/class/firmware/data
echo 0 > /sys/$DEVPATH/loading

Did you check if there are indeed firmware files in your initrd.gz, which filenames are matching what are needed by the script (as appeared in /tmp/log ) ?

HI, not sure if you have seen the post that i posted before your reply. re-posting the required part.

instead of sending the bnx2 firmware data ( /path/$FIRMWARE ) to /sys/$DEVPATH/data, i was re-directing it to /sys/class/firmware/data.

Here is the final script

#!/bin/sh
#[ -z "$FIRMWARE" ] && exit
echo 1 > /sys/$DEVPATH/loading
cat /lib/firmware/$FIRMWARE > /sys/$DEVPATH/data
echo 0 > /sys/$DEVPATH/loading

I must thank you for your patience in guiding me for getting into a resolution. I really appreciate and sorry for the change in path that i took by seeing the kernel patch .. My bad analysis

Thanks much !
- Krishnaprasad

[kl522]

Haven't I told you between you and a working system is just this shell script ?

[krishnaprasadk]

Haven't I told you between you and a working system is just this shell script ?

Yes.. My bad !! .. when i saw the error of vmap failure, i saw a matching Linux kernel posting as well talking about the same issue .. so changed my mind and went after that .. But good Experience

Thanks !