On Wed, 2013-01-23 at 16:38 +0800, Wolfgang Denk wrote:
> Dear Jim Lin,
>
> In message <1358923034-2727-1-git-send-email-ji...@nvidia.com> you wrote:
> > Autoboot timeout defined by CONFIG_BOOTDELAY will not be accurate if
> > CONFIG_USB_KEYBOARD and CONFIG_SYS_USB_EVENT_POLL are defined in
> > configuration file and when tstc() function for checking key pressed takes
> > longer time than 10 ms (e.g., 50 ms) to finish.
> ...
>
> > /* delay 100 * 10ms */
> > - for (i=0; !abort && i<100; ++i) {
> > + j = 100;
> > + for (i = 0; !abort && i < j; ++i) {
> > + ts = get_timer(0);
> > if (tstc()) { /* we got a key press */
> > abort = 1; /* don't auto boot */
> > bootdelay = 0; /* no more delay */
> > @@ -263,7 +266,11 @@ int abortboot(int bootdelay)
> > # endif
> > break;
> > }
> > - udelay(10000);
> > + ts = get_timer(ts);
> > + if (ts < 10)
> > + mdelay(10 - ts);
> > + else
> > + j = 1000 / (int) ts;
> > }
>
> This is a pretty awkward implementation. If you feel the current
> plain delay loop based approach is not exact enough, then please
> implement a real timeout - you are calling the timer anyway, so just
> use the timer values instead of a loop count.
>
Thanks for pointing this out. I will improve it and resend.
-----------------------------------------------------------------------------------
This email message is for the sole use of the intended recipient(s) and may
contain
confidential information. Any unauthorized review, use, disclosure or
distribution
is prohibited. If you are not the intended recipient, please contact the
sender by
reply email and destroy all copies of the original message.
-----------------------------------------------------------------------------------
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
