1. 14 Dec, 2016 1 commit
  2. 01 Dec, 2016 5 commits
  3. 07 Jul, 2016 1 commit
  4. 28 Nov, 2014 3 commits
    • Alessandro Rubini's avatar
      kernel config: change in timing setup · fe9f6db6
      Alessandro Rubini authored
      This changes the kernel configuration, in two ways:
      
      1- It uses CONFIG_NOHZ, which enables Hight Resolution Timers
      
      Unfortunately this has no effect, as the timeevent device for AT91
      doesn't support oneshot mode.  This means that if you usleep(100)
      you'll wait 10ms.  Thus, we can't remove the busy-looping in libwr/util.c .
      
      This is the output of my libstamp sample program:
      
           0.003 -- stamping overhead
          12.243 -- usleep     1 usec
          10.005 -- usleep     1 usec
           9.963 -- usleep     2 usec
          10.037 -- usleep     5 usec
          10.083 -- usleep    10 usec
           9.905 -- usleep   100 usec
          10.394 -- usleep  1000 usec
          19.775 -- usleep 10000 usec
         109.925 -- usleep 100000 usec
      
      2- It moves CONFIG_HZ from 100 to 1000. Thus, we have 1000 timer interrupts
      per second.
      
      This means, in practice, that if you usleep(100) you wait 1ms.  This
      costs around 2% of CPU power (measured by running a cpu-busy program
      before and after the change, in both cases after killing all
      processes), but makes stuff millisecond-grained instead of
      10ms-grained. This is a benefit for the PTP daemon and everything uses
      timeouts in system calls.
      
      This is libstamp again:
      
           0.003 -- stamping overhead
           0.662 -- usleep     1 usec
           0.869 -- usleep     1 usec
           0.976 -- usleep     2 usec
           0.951 -- usleep     5 usec
           0.993 -- usleep    10 usec
           0.999 -- usleep   100 usec
           1.999 -- usleep  1000 usec
          11.006 -- usleep 10000 usec
         101.043 -- usleep 100000 usec
      Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
      fe9f6db6
    • Alessandro Rubini's avatar
      boot scripts: better examples · 56891b34
      Alessandro Rubini authored
      This updates binaries/wrboot-* to be more commented and complete.
      It also adds wrboot-install and wrboot-nand, that I personally used.
      
      As a side effect, "mem=64m" is removed by all command lines, as it has
      been properly autodetected for a few years now, so it is not needed
      any more.
      
      Documentation is updated too.
      Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
      56891b34
    • Alessandro Rubini's avatar
      0b161dcf
  5. 30 Sep, 2014 1 commit
  6. 29 Sep, 2014 1 commit
    • Benoit Rat's avatar
      kernel: add new DF AT45DB641E setting into kernel for SCB v3.4 · 66595328
      Benoit Rat authored
      Standard JEDEC ID is only 24bits to identify a DF chip.
      It also has an optional Extended Device Info (EDI) on bytes 4 and/or 5
      that need to be read to differentiate some DF chips. (i.e, the
      difference between AT45DB641E and AT45DB642D is made by byte 4).
      66595328
  7. 24 Sep, 2014 1 commit
  8. 28 Jul, 2014 1 commit
    • Alessandro Rubini's avatar
      bugfix: kernel: use more relaxed nand timings · bb56d5b5
      Alessandro Rubini authored
      We used the timing from the g45ek, but ours is slower. Actually, ours
      is slower only in 16-bit mode, and has the same timing when used in
      8-bit mode.
      
      Our timing setup was outside of the allowed specification, and resulted
      in random and unreproducible failures.  The "visible" effect is
      that reading 100MB takes 13.4s instead of 11.4s, measured with:
      
        time dd bs=1k count=102400 < /dev/mtd1 > /dev/null
      
      You can try another, still slower, setup just by hand, like this
      (in this order):
      
         devmem 0xffffe83c w 0x00051003
         devmem 0xffffe838 w 0x000f000f
         devmem 0xffffe830 w 0x04060406
      
      but the current settings (41003, 000c000c, 02040204) are alread within
      specification.
      Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
      bb56d5b5
  9. 27 Jul, 2014 1 commit
  10. 22 Jul, 2014 1 commit
  11. 24 Jun, 2014 2 commits
  12. 17 Jun, 2014 1 commit
  13. 13 Jun, 2014 2 commits
  14. 31 Mar, 2014 1 commit
  15. 29 Oct, 2012 1 commit
  16. 07 Aug, 2012 3 commits
  17. 06 Aug, 2012 1 commit
  18. 02 Aug, 2012 1 commit
  19. 29 Jul, 2012 1 commit
  20. 16 Jul, 2012 1 commit
  21. 11 Jun, 2012 1 commit
  22. 12 Mar, 2012 1 commit
  23. 18 Jan, 2012 1 commit
  24. 12 Jan, 2012 1 commit
  25. 09 Jan, 2012 1 commit
  26. 23 Oct, 2011 1 commit
  27. 11 May, 2011 1 commit