Right so first priority is to get UART output. My current UART cable with a 612K resistor (I think it was 612K) doesn't give me any output. I'd say that is the wrong resistor for this device, so I need to find out which one it is. However the cable does JIG the phone to start up.

Originally Posted by hillbeast

Right so first priority is to get UART output. My current UART cable with a 612K resistor (I think it was 612K) doesn't give me any output. I'd say that is the wrong resistor for this device, so I need to find out which one it is. However the cable does JIG the phone to start up.

Update to this: got this output:

AST_POWERON

BOOTING COMPLETED

That's the modem speaking to me over UART. Gotta change the UART mode to PDA instead of MODEM. Will do that once I root the phone.

Originally Posted by hillbeast

Update to this: got this output:

AST_POWERON

BOOTING COMPLETED

That's the modem speaking to me over UART. Gotta change the UART mode to PDA instead of MODEM. Will do that once I root the phone.

Another update, I did this in adb shell:

echo PDA > /sys/devices/platform/switch-sio/uart_sel

Then rebooted the phone with my UART cable attached and now I get this:

Uncompressing Linux... done, booting the kernel.

So it's giving me output up until the kernel boots which told me the console attribute in the cmdline isn't set. I looked and that confirmed it that it wasn't. I will get the sourcecode for a kernel and compile it with the console attribute.

So yes, this phone will do UART. I just have to do it a bit weirdly.

I made a discussion thread here, post only developement related things in here, and everything else goes there

Originally Posted by loneagl

@hillbeast
Sorry to interrupt dude
Linux is Greek to many of us......
so does this mean kernel 3.x is possible???

Sent from my GT-I9003 using XDA

It means I will be able to debug the kernel while I am developing it.

Originally Posted by Skander1998

I made a discussion thread here, post only developement related things in here, and everything else goes there

Thanks. I will subscribe to it.

Sent from my GT-I9100 using XDA

Right so I just had to figure out how to compile kernels on this phone. It's completely different to doing it on the Galaxy 3. On the G3, we just use zImages, whereas here it's using boot.imgs which is quite different. I've updated my build.sh to account for this. I'm still not actually working on Kernel 3.x. I'm still learning the device and getting it set up so I can develop on it.

Originally Posted by hillbeast

Right so I just had to figure out how to compile kernels on this phone. It's completely different to doing it on the Galaxy 3. On the G3, we just use zImages, whereas here it's using boot.imgs which is quite different. I've updated my build.sh to account for this. I'm still not actually working on Kernel 3.x. I'm still learning the device and getting it set up so I can develop on it.

Maybe this help

Originally Posted by hillbeast

Right so I just had to figure out how to compile kernels on this phone. It's completely different to doing it on the Galaxy 3. On the G3, we just use zImages, whereas here it's using boot.imgs which is quite different. I've updated my build.sh to account for this. I'm still not actually working on Kernel 3.x. I'm still learning the device and getting it set up so I can develop on it.

Yup.... the boot.img contains both the zImage and ramdisk ...

Sent from my GT-I9003 using XDA

Originally Posted by TheFrankenstain

Maybe this help

Already figured it out, but thanks anyway.

Originally Posted by arindammanidas

Yup.... the boot.img contains both the zImage and ramdisk ...

Sent from my GT-I9003 using XDA

zImages can contain ramdisks too. Been using it like that on the G3 for long time. We used LZMA compression and managed to cram a hell of a lot into the boot partition.

Originally Posted by hillbeast

Right so I just had to figure out how to compile kernels on this phone. It's completely different to doing it on the Galaxy 3. On the G3, we just use zImages, whereas here it's using boot.imgs which is quite different. I've updated my build.sh to account for this. I'm still not actually working on Kernel 3.x. I'm still learning the device and getting it set up so I can develop on it.

i can make boot.img for u

if u want