Difference between revisions of "Linux Debug"

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(Changing FPGA IP's registers from Linux user space with fpgaregs)
m (Examples:)
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  # imxregs OCR1
 
  # imxregs OCR1
  
* Write 123 to OCR1_D register:
+
* Write 0x00000123 to OCR1_D register:
 
  # imxregs OCR1_D 123
 
  # imxregs OCR1_D 123
  

Revision as of 23:15, 30 July 2008

    • Tips to do debug under linux **

Introduction

On this page, you will find usefull informations for debugging Armadeus under Linux

Testing your custom Linux kernel before flashing it

You can test a linux kernel you've generated without having to reflash your board and destroy your currently working image. Indeed Linux kernel images can be loaded and started from SDRAM with U-Boot:

BIOS> tftp 8000000 linux-kernel-2.6.16-arm.bin
BIOS> bootm 8000000


Changing processor registers from Linux user space with imxregs

This tool allows you to access i.MXL registers from Linux userspace/console. This way you debug your driver or access i.MXL hardware functionnalities directly from Linux console.

  • First, you have to enable this tool in Buildroot (package selection for target -> Hardware handling / blockdevices and filesystem maintenance -> imxregs):
$ make menuconfig

Once done, compile it:

$ make

The generated file is located in buildroot/build_arm/imxregs-1.0/. Now you can copy it on your target.

  • To use it, you must clear PAR 1&2 registers (registers access rights) before launching Linux kernel, so in U-Boot type:
BIOS> mw.l 0x00200008 0
BIOS> mw.l 0x00210008 0

If you use it frequently, you can define a small script in U-Boot:

BIOS> setenv unlock_regs mw.l 0x00200008 0\; mw.l 0x00210008 0
BIOS> saveenv

and call it like that before launching your kernel:

BIOS> run unlock_regs
  • Then in Linux console/terminal, launch imxregs like that:
# imxregs REGISTER_NAME  (give it the register name as printed in iMX Ref Manual or just the begining of the name)

or

# imxregs    (to dump all supported registers)

Examples:

  • Show OCR1 registers of each GPIO Port:
# imxregs OCR1
  • Write 0x00000123 to OCR1_D register:
# imxregs OCR1_D 123

Changing FPGA IP's registers from Linux user space with fpgaregs

see FPGA_register

Links


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