AnsweredAssumed Answered

Halt when starting kernel

Question asked by GatsbyDSP on Sep 3, 2013
Latest reply on Sep 11, 2013 by GatsbyDSP

I have made a custom buildroot for my custom BF537 board but it fails to start the linux kernel, stopping here:

bootm 0x1000000

## Booting kernel from Legacy Image at 01000000 ...

   Image Name:   bf537-0.2-3.5.7-ADI-2012R2

   Created:      2013-09-03  13:23:20 UTC

   Image Type:   Blackfin Linux Kernel Image (gzip compressed)                 

   Data Size:    3732795 Bytes = 3.6 MiB                                       

   Load Address: 00001000                                                      

   Entry Point:  001d7d28                                                      

   Verifying Checksum ... OK                                                   

   Uncompressing Kernel Image ... OK                                           

Starting Kernel at = 001d7d28


From searching the forums I get the impression the kernel is running somewhere but I just can't see it.


There seems to be several parameters I can change:

- In make menuconfig when building the buildroot uImage I can set the 'Port to run getty (login prompt) on'. For me this is ttyUSB0. This doesn't appear to work for me. Am I right to enable this feature?

- In u-boot there are environment variables for bootargs and ramargs:

bootargs=root=/dev/mtdblock0 rw clkin_hz=27000000 earlyprintk=serial,uart0,57600 console=ttyBF0,57600

ramargs=root=/dev/mtdblock0 rw clkin_hz=27000000 earlyprintk=serial,uart0,57600 console=ttyBF0,57600


- I tried changing the console= parameter to ttyUSB0 but it didn't help.

- I tried changing the uart0 to ttyUSB0


What is earlyprintk? According to this link([]=earlyprintk) I must enable it, but I don't see it in the buildroot make menuconfig.

- ttyBF0 doesn't exist on my workstation in /dev.


Obviously I'm getting some data at the console because I do reach the starting kernel at....


So I've got:

- port to run getty(make menuconfig)

- earlyprintk

- console


What do they each do?