Problem with autoboot_timeout

From: Mayank Sharma (mayank@impulsesoft.com)
Date: Wed Feb 05 2003 - 23:30:47 EST

  • Next message: Jamey Hicks: "Re: Problem with autoboot_timeout"

    Hi all,
          I was facing a problem with the autoboot feature of the boot
    loader. The bootldr was not waiting for the default 10 seconds timer to
    expire before starting to boot linux. It seems that the bootldr relies
    on the RCNR timer to see if any key has been pressed before
    autoboot_timeout seconds. But the RCNR takes some time to stablize (The
    manual says 2-10 seconds) before which it cannot be used reliably. I
    fixed the problem by puting the following loop before the line "c =
    awaitkey_seconds(autoboot_timeout, NULL);" in bootldr.c

      while(!CTL_REG_READ(SA1100_POSR))
          ; /* Waiting for RCNR to stablize */

        When the RCNR is stablized the 0'th bit of POSR will be set, and
    hence we can use the RCNR timer reliably.

    Rgds,
    Mayank

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