[ANN][MINI2440] modern kernel (2.6.29 FINAL) git repository

[scootklein]

Sorry I'm a little new to all this. I attempted to build the kernel with "make mini2440_defconfig" but get:
***
*** Can't find default configuration "arch/x86/configs/mini2440_defconfig"!
***
What do I need type to make it search the correct dir. Thanks.

A few things...
1. You're on an X86 machine and are compiling for an ARM machine. This requires a cross-compiler. Search "ELDK" on google and download the linux-arm-gcc.
2. After that is done, you need to edit the file "Makefile" and change a few variables (seen below). Make sure you set CROSS_COMPILE to wherever you installed your "eldk" too.

export KBUILD_BUILDHOST := arm
ARCH ?= arm
CROSS_COMPILE ?= /share/eldk/usr/bin/arm-linux-

3. http://www.arm.linux.org.uk/docs/kerncomp.php

[alvishidla]

Thank you wery much for your work.

I have mini2440 +7' LCD
For kernel and u-boot compilation i use ELDK-4.2 from denx.de.
I compiled kernel from git and it laods from u-boot normally. (get BusyBox nfs->rootfs)
But whole LCD goes WHITE.
If i use LCD test program or default backup image from cd then logo loads ok.
In qemu from git i see ArmWorks logo with same uImage.

Please any help.
Thank you.

[buserror]

You need to pass "mini2440=1tb" for the kernel to configure itself for a 7". Do read the early boot messages of the kernel you can see what values represent what size.

I haven't tested the 7" support in hardware tho, I don't have one yet -- should work tho

[alvishidla]

Yes i known about mini2440=1tb.
I compiled it as default in kernel.
And in serial console see [800x480] mode selected.
Now i get LCD registers settings from test sources in CD and can see
logo diplayed. But this is not stable.
Frequently i get WHITE lcd screen and after power off/on get normal lcd picture.
Looks like somthing wrong with LCD initialisation or with control timings

Thank you

[buserror]

Well as I said I dont have a 7". I tried to get one cheap from esky but he went AWOL, and the armwork's one is in the post.

Have you set the jumper to 3.3 on the board ? I think it's needed for the 7", feeding it the other voltage might damage it.

Otherwise, I'll look when I get one..

[LeshaK]

One man had same problem on 7" mini2440,
he used bad power supply with about 4.5-4.7V
when he get normal ps with 5V, problem disappeared

[alvishidla]

Thank you for ansvers.
I measured power supply voltage with multimeter and it is 4.7-4.8V.
I will try replace another PS monday.
Tested LCD voltage.
If i switch Jumer to 3.3V lcd all time goes WHITE and backlight
is more darken of course.
In LCD manual i found nominal voltage is 3.3V but maximal absolute rating is 6V.
I think LCD can be drived from 5V supply without damage.

[buserror]

If you look at the schematic you see the "5V" for the LCD is unregulated, it comes straight from the wall; I don't know how the decoupling is done on the back of the LCD but maybe it would also need a couple of capacitors to work properly..

[alvishidla]

I agree with you.
Board needs strong regulated PS.

[esky-sh]

Hi,

The LCD module needs 2 power supply voltages, one is 5v for backlight and another is 3.3v for logic.
Actually you can find a 5v to 3.3v regulator on LCD backlight board. And that is reason why we only need one 5v power supply from CPU board.

I suggest you have a check from software perspective first since the test program works well.