2.6.35 Kernel Development

**Xmister** · 12-07-2010, 01:46 AM

I've ported all the things that spica would need to 2.6.35 kernel(in hurry, so possibly not 100% perfect), but for some reason the phone can't get to execute init (The progress bar won't come up).

If anyone knows how to debug the kernel itself, or
If any dev here would like to help figuring out the problem, I would be happy for that.

The source is here: http://github.com/Xmister/cm-kernel

**Duobix** · 12-07-2010, 08:20 AM

What were you using? Only booting kernel without any android system over it?
RFS? EXT? How should it work? Was it working in previous non-100% versions?

**LeshaK** · 12-07-2010, 08:43 AM

May be this help you
this is the back of spica under battery (under IMEI number)

this is from service manual
pads name

I think you need TP_UART_TX, TP_UART_RX + TP_GND
and you can connect rs-232 converter & can watch boot log of kernel (may be need to add init string to redirect boot log to s3c6410 serial port)

**Xmister** · 12-07-2010, 10:08 PM

Originally Posted by Duobix

What were you using? Only booting kernel without any android system over it?
RFS? EXT? How should it work? Was it working in previous non-100% versions?

There is android on ext filesystems, and I've ported XSR and RFS too, but that's all doesn't matter as the kernel not executing init, which would load XSR, which would map the flash devices, and only there would the system matter.
It wasn't working of course...

Originally Posted by LeshaK

I think you need TP_UART_TX, TP_UART_RX + TP_GND
and you can connect rs-232 converter & can watch boot log of kernel (may be need to add init string to redirect boot log to s3c6410 serial port)

So there is no software way? I can see the usb interface(Samsung Modem) right after power on for 2-4 secs (That's probably the kernel boot), and after that it disappears. Isn't there any soft I can use to quickly connect and get dmesg?

BTW. I've never used rs-232 converter, actually I don't have any, and as I see they are quite expensive (around 150-200€). And I'm not sure which one I should buy if I couldn't find another way..can you point me to a cheaper one which would be good for this?

**darth_llamah** · 12-08-2010, 11:41 AM

Originally Posted by Xmister

I've never used rs-232 converter, actually I don't have any, and as I see they are quite expensive (around 150-200€).

You can look for USB cable for older mobiles (like Sony-Erisccon t610, k300)- they are basically usb<->rs232 (ttl level) converters- like this one. Best ones would be with PL-2302 chipset which is used in most service cables

**cadavre** · 12-08-2010, 12:25 PM

Originally Posted by darth_llamah

Best ones would be with PL-2302 chipset

Exactly.

**tom3q** · 12-08-2010, 08:34 PM

An odd Serial Port on Spica (FSA9480 attached)

Another, IMHO much easier way to access the serial port. Anyway, the level converter is still needed, I'd recommend something based on FT232RL or FT2232H. (Costs about 30 PLN ~ 10 USD here in Poland).

Also the progress bar is just a simple animation made by the frame buffer driver and is unrelated to the real boot progress.

**Duobix** · 12-08-2010, 11:45 PM

Originally Posted by tom3q

An odd Serial Port on Spica (FSA9480 attached)

Also the progress bar is just a simple animation made by the frame buffer driver and is unrelated to the real boot progress.

So, might this be that the graphics driver is workin incorrectly? Or is it loaded later than this? Maybe just waiting
some time for the system to boot would do the job?

Btw couldn't someone help him with this crazy cable debug by doing it?

**ch33kybutt** · 12-09-2010, 05:14 PM

Some info on getting KGDB to work via USB available here ... Enabling KGDB for Android - BootLoader with sources using USB driver on MSM chip is here https://github.com/dankex/kgdb-android

I'm sure that Xmister has the skills to port it to Spica

Btw, I tried compiling but keep getting the following error,

Code:

net/built-in.o: In function `wiphy_rfkill_start_polling':
activity_stats.c:(.text+0x121540): undefined reference to `rfkill_resume_polling'
make: *** [.tmp_vmlinux1] Error 1

**munchy_cool** · 12-09-2010, 05:31 PM

Originally Posted by ch33kybutt

Btw, I tried compiling but keep getting the following error,

Code:

net/built-in.o: In function `wiphy_rfkill_start_polling':
activity_stats.c:(.text+0x121540): undefined reference to `rfkill_resume_polling'
make: *** [.tmp_vmlinux1] Error 1

Fixed by enabling 'CONFIG_RFKILL_PM'.

Original link - http://android.modaco.com/content-pa...pment/page/80/