[ts-7000] High Resolution Timers on 2.6.21-ts Kernel

[Stefan Agner <>]

Hello,
 
I try to reach some Real Time needs with the TS-7800 board. Therefore a patched 
the 2.6.21-ts kernel with Ingo's PREEMPT_RT-Patch which worked fine so far. The 
kernel boots completely. I tried to compile the "RT-Hello world" from 
http://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO. I inserted code so that a 
Sqarewave should be visible on some GPIO pins (see Attachment, compile with gcc 
-lrt rthello.c). This works so far, my oscilloscope shows a sqarewave, but not 
with 50us distance, but with 10ms distance. I already read about here in the 
mailing list. As far as I understood the discussions, it seems to be a problem 
of lacking HRTimers:

# cat /proc/timer_list
Timer List Version: v0.3
HRTIMER_MAX_CLOCK_BASES: 2
now at 102967692000 nsecs

cpu: 0
 clock 0:
  .index:      0
  .resolution: 10000000 nsecs
  .get_time:   ktime_get_real
active timers:
 clock 1:
  .index:      1
  .resolution: 10000000 nsecs
  .get_time:   ktime_get
active timers:

I then compiled Alexander Clouter's tree (which is a 2.6.29-rc5 kernel) with 
High Resolution Timers but without PREEMPT_RT Patch (wasnt avilable for rc5 
atm). But anyway, here they are, real HRTimers:

# cat /proc/timer_list
Timer List Version: v0.4
HRTIMER_MAX_CLOCK_BASES: 2
now at 606613986235 nsecs

cpu: 0
 clock 0:
  .base:       c048a440
  .index:      0
  .resolution: 1 nsecs
  .get_time:   ktime_get_real
  .offset:     1235464200238099709 nsecs
active timers:
 clock 1:
  .base:       c048a470
  .index:      1
  .resolution: 1 nsecs
  .get_time:   ktime_get
  .offset:     0 nsecs

My squarewave example worked, this time with 50us distance, but with some 
misses (due to lack of PREEMPT_RT).

Now, my question, does anybody brought the HRTimers on 2.6.21-ts kernel to 
work? Or the other way around, does anyone ported the NAND/SD drivers to 
2.6.29? Alexander Clouter told me that MTD works without DMA (which is not 
optimal for my needs) and SD doesnt work at all atm. All the other devices 
should work (network, usb does for sure)...

Thanks
bye
Stefan


     

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rthello.c
Description: Binary data