Robert Brown <rebrown@exemail.com.au> · Sat, 22 Mar 2014 11:02:26 +1100

On 10.04.14 18:28, Robert Brown wrote:

Following some research on the later kernels and the role of u-boot and dtsb
I have used the following - but again without a successful boot:

...

When it fails to boot there's not much chance of troubleshooting as I have
not been able to get to the uboot prompt.
Anyone got any thoughts?

The one time I set out to port linux to an embedded platform (PPC in
that case), I made sure I had a BDI2000 debugger before starting.
It's good for u-boot or kernel debugging, not so good for user-space
processes, because it supports only one contiguous memory space. In
particular the bdiGDB system for the BDI2000 supports Linux kernel
debugging including when the MMU is enabled. I found it invaluable while
struggling to get to the uboot prompt. (More than half a decade ago,
now.)

In its absence, I would only expect to make progress given logging (e.g.
on a serial port) from uboot and the kernel. While most of my quarter of
a century of embedded systems development used In-Circuit Emulators,
good progress can be made with nothing more than strategically sprinkled
printf statements and a good helping of persistence.

Are you using your own Board Support Package, or relying on someone
else's work there? (I.e. Is that, at least, tested?)

Erik

Hi
Is anyone able to offer helpful tips or new directions with this:
I am wanting to use a usb device with ID 0bda:2838 Realtek Semiconductor 
Corp. RTL2838 DVB-T on a MK802II mini pc using the Allwinner A10 cpu.

This device requires modules rtl2830.ko, rtl2832.ko and dvb_usb_rtl28xxu.
The second of these modules does not seem to exist without patches on 
kernel 3.4 but on a raspberry pi I have been successful using kernel 
3.10.25+.

Here is the relevant lsmod from the pi:
r820t                  16279  1
rtl2832                 8020  1
dvb_usb_rtl28xxu       14333  1
dvb_usb_v2             14860  1 dvb_usb_rtl28xxu
rc_core                16313  3 dvb_usb_rtl28xxu,dvb_usb_v2
rtl2830                 7378  1 dvb_usb_rtl28xxu
dvb_core               92797  3 rtl2830,rtl2832,dvb_usb_v2

However when I try to compile a kernel for the A10 with 3.10.25+ I have 
no success.

If I use the raspi sources for the cross-compile:
https://github.com/raspberrypi/linux/archive/rpi-3.10.y.tar.gz
I get errors that seem unresolvable:
e.g.: undefined reference to `v6wbi_flush_kern_tlb_range'

If I use the sunxi kernel source:
https://github.com/linux-sunxi/linux-sunxi/tree/reference-3.10
the compile completes without error and I get modules and a uImage file 
but the device won't boot

I am using this as a guide: 
http://jas-hacks.blogspot.com.au/2012/10/hackberry-a10-compiling-kernel-armhfs.html

I have tried using various .config files as a starting point including 
the pi and from the earlier 3.4 kernel without success

Does anyone have any experience in this area? Any help would be much 
appreciated.

Thanks
Rob

Subject:	Fwd: Cross-Compiling for Armv7
Date:	Sat, 22 Mar 2014 11:02:26 +1100
From:	Robert Brown <rebrown@exemail.com.au>
To:	luv-beginners@luv.asn.au

Subject:	Cross-Compiling for Armv7
Date:	Thu, 20 Mar 2014 21:46:03 +1100
From:	Robert Brown <rebrown@exemail.com.au>
To:	luv-beginners@luv.asn.au