Hi folks,
I tried to compile the linux kernel source that came in the BeagleBone SDK using /proc/config.gz
and the toolchain from the SDK.
It failed with a pair of ‘relocation truncated to fit: R_ARM_THM_JUMP11’ errors.
However, am335x_evm_defconfig, did result in a clean compile but the kernel would not run.
What is the link to get the original, running linux kernel source ?
Thnx much,
j
John,
I haven’t tried using the /proc/config.gz myself. I use the “make linux” target in the SDK top-level Makefile which builds the kernel using the arch/arm/configs/tisdk_am335x-evm_defconfig file. Can you give that a try?
Sincerely,
Chase Maupin
Software Applications
ARM MPU
For support:
Forums - http://community.ti.com/forums/
Wiki - http://wiki.davincidsp.com/
Hi Chase,
I tried what you suggested. It compiled cleanly but when I tried it, it would not run to console promt AFAIK.
How do I know…
I changed the /etc console setup to send . to /var/log/syslog and did a touch just in case.
The kernel did not write anything to /var/log/syslog.
P.S. I verified the approach using the original uImage and it worked fine.
An aside… How can a get std serial console output. ? I’ve tried several things to no avail.
(I have a USB to serial converter for Bone’s host port)
Thnx much,
j
Hi Chase.
Yes. I add the udev rules and ftdi_sio is being loaded but no joy so far.
I tried minicom /dev/ttyUSB0 but connecting merely show USB storage, on my host syslog/console
I’ll beat on some more… Perhaps I’ll try OpenOCD to talk to the ftdi.
Further, udev is fine for Linux but where are u-boot (and xload) messages
Serial console output should be available just after 1st UART init & not be so painful
Where is the kernel source that actually works ?
Thnx
j
JTAG is on ttyUSB0, serial on ttyUSB1. I don't believe you can use
minicom to talk to JTAG.
Here's how I get a serial console from a Linux host:
Plug in the beaglebone by mini USB (no converter needed).
modprobe ftdi_sio vendor=0x0403 product=0xa6d0
If you used the udev rules in the README and have reloaded rules,
a symlink will be made to /dev/beaglebone-serial, which you can then use
in place of the ttyUSB device.
The devices will show up whether or not the mass-storage or ethernet
gadgets are in use.
Either screen -fn /dev/ttyUSB1 115200 (C-a esc to scroll, C-a \ to exit) or
set minicom to 115200, no hardware flow control
You won't see anything immediately, hit enter to get a login prompt.
Once logged in you can reboot and see early messages and hit a key to
enter U-Boot.
At the UBoot prompt, type help, or boot to continue booting.
Frank,
Thanks very much… worked with minicom :))
(my USB0 and sequence were wrong: rmmod ftdi_sio needed 1st. cuz it was already in)
Anyway, I saw u-boot on watchdog reboot and I’m now at the u-boot prompt :))
I was right, kernel hangs at…
Image Name: Linux-3.1.0-rc8
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 796360 Bytes = 777.7 KiB
Load Address: 00008000
Entry Point: 00008000
Verifying Checksum … OK
Loading Kernel Image …
Then after a while watchdog reboots.
Well debug time…
Thnx again Frank & Chase
J