[Q] USB HOST support SiyahKernel 3.0beta6 - Galaxy S II Q&A, Help & Troubleshooting

Dear Friends,
I have been building custom USB devices for Android as a hobby during my spare time since the end of last year. I have been succesfully using until now Siyah kernel V2.5.2-VWM + Android 2.3.5 in order to test my hardware prototypes with my SGS2. This version of Siyah kernel was compiled with some flags (CONFIG_SEC_WHITELIST=n) that disabled a white-list placed by Samsung that prevented third-party USB devices from connecting to the phone.
I updated yesterday to Siyah-v3.0b6 and CM9 and found that my USB devices are not working (OTG devices like my USB memory stick still works). I tracked the problem using the "lsusb" terminal command and the "USB Device Info" app, and I found that my devices are not enumerated correctly anymore. This is a symptom that the Samsung white-list is enabled and it is filtering USB devices that are not found in the list.
I may be wrong, but I think the workaround is only in the compilation flag above described. Does anyone of you people know of any kernel supporting ICS that is working with custom USB devices, or HID devices (joysticks, keyboards, mouse, gamepads, etc)?
I dont have enough credits to post this in the developer Forum so that Gokhanmoral can receive this feedback. I hope he may eventually read this post.
Thanks in advance for your help,
Saul

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Did you try Beta 5? I had problems with Beta 6, I could not access the phone via adb or see any of the drives on my PC via MTP. Maybe there are general USB problems in that version. Going back to Beta 5 solved it.

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rovo89 said:
Did you try Beta 5? I had problems with Beta 6, I could not access the phone via adb or see any of the drives on my PC via MTP. Maybe there are general USB problems in that version. Going back to Beta 5 solved it.
Click to expand...
Click to collapse
Thanks a lot for the suggestion. I am digging on this issue and found that it is more related to a compilation flag of the new kernel for ICS.
regards,
Saul

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USB Host support for custom devices
Hello Saul,
I am experiencing a similar problem with my custom USB device. I have a rooted Samsung Galaxy S2 (GT-I9100) with android 4.0.3.
Did you manage to complie a kernel that works? I downloaded the GT-I9200_ICS_Opensource_Update4.zip kernel source files from opensource.samsung.com but I am not able to compile it. I got the error:
Code:
drivers/media/video/samsung/mali/linux/mali_osk_mali.c:23:98: error: arch/config.h: No such file or directory
Any ideas or guidance would be greatly appreciated.
Model: GT-I9100
Android version: 4.0.3
Baseband: I9100BULP6
Kernel: [email protected]#3
Compilation: IML74K.BULPC

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Hi Saul and everybody,
I figured out what the problem was; this is just in case it's useful to someone.
It seems the "make clean" and "make mrproper" routines in the Makefile created by Samsund does not work properley and you need to unzip the entire source code again and restart the proces from scratch every time you want to change the .config and re-compile.
Afterwards, I also noticed the image won't work because I needed to exctract an initramfs for my device and to link it to the new kernel during the kernel compilation process and setting the CONFIG_INITRAMFS_SOURCE .config parameter pointing to the location where it was extracted.
In order to extract my initramfs, I applied the following script (which is an adaptation I made to this one http://forum.xda-developers.com/wiki/Extract_initramfs_from_zImage) to a zImage kernel included in a stockrom that worked fine in my device:
Code:
#!/bin/bash
#
#Source: http://forum.xda-developers.com/wiki/Extract_initramfs_from_zImage
#
#Extract initramfs from zImage
#
#initramfs provides the rootfs when booting a Linux kernel on a mobile device.
#Below script may be helpful if you are interested in extracting such an image from a zImage kernel file.
#Tested on Ubuntu for Samsung Galaxy S firmware. Other zImages may have different archiving options - would require a #modification to the script...
#
#After extracting the initramfs, it can be unpacked into the local directory with
#
#cpio -v -i --no-absolute-filenames < <path-to-initramfs.img>
#
zImage=$1
#========================================================
# find start of gziped kernel object in the zImage file:
#========================================================
#
# Next two lines modified by Federico Linares
#
p1=`perl -e 'print "\x1F\x8B\x08"'` # Added by Federico Liares
pos=`grep -P -a -b --only-matching $p1 $zImage | cut -f 1 -d :` # Modified by Federico Linares
echo "-I- Extracting kernel image from $zImage (start = $pos)"
#========================================================================
# the cpio archive might be gzipped too, so two gunzips could be needed:
#========================================================================
dd if=$zImage bs=1 skip=$pos | gunzip > /tmp/kernel.img
pos=`grep -P -a -b -m 1 --only-matching $'\x1F\x8B\x08' /tmp/kernel.img | cut -f 1 -d :`
#===========================================================================
# find start and end of the "cpio" initramfs image inside the kernel object:
# ASCII cpio header starts with '070701'
# The end of the cpio archive is marked with an empty file named TRAILER!!!
#===========================================================================
if [ ! $pos = "" ]; then
echo "-I- Extracting compressed cpio image from kernel image (start = $pos)"
dd if=/tmp/kernel.img bs=1 skip=$pos | gunzip > /tmp/cpio.img
start=`grep -a -b -m 1 --only-matching '070701' /tmp/cpio.img | head -1 | cut -f 1 -d :`
end=`grep -a -b -m 1 --only-matching 'TRAILER!!!' /tmp/cpio.img | head -1 | cut -f 1 -d :`
inputfile=/tmp/cpio.img
else
echo "-I- Already uncompressed cpio.img, not decompressing"
start=`grep -a -b -m 1 --only-matching '070701' /tmp/kernel.img | head -1 | cut -f 1 -d :`
end=`grep -a -b -m 1 --only-matching 'TRAILER!!!' /tmp/kernel.img | head -1 | cut -f 1 -d :`
inputfile=/tmp/kernel.img
fi
# 11 bytes = length of TRAILER!!! zero terminated string, fixes premature end of file warning in CPIO
end=$((end + 11))
count=$((end - start))
if (($count < 0)); then
echo "-E- Couldn't match start/end of the initramfs image."
exit
fi
echo "-I- Extracting initramfs image from $inputfile (start = $start, end = $end)"
dd if=$inputfile bs=1 skip=$start count=$count > initramfs.cpio
And that's almost all. At this point everything works fine except the Wifi. I think I have to link it to the kernel as a module, but I am not sure where to get the module from.
Any help would be greatly appreciated.
______________________________
Device: GT-I9100
Android version: 4.0.3
Baseband: I9100BULP6
Kernel: 3.0.15-I9100G
Compilation: IML74K.BULPC