tree f10a8c278c45e8bde5afd2b92434612af1afec4c
parent 301703bc5b84d5e4a38298469ef00fdfe9aaa6a2
author Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> 1275601693 +0000
committer Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> 1275601693 +0000

Measure OS timer precision to refine calibration

Do not trust the OS at all and measure timer precision before
calibrating the delay loop and use that measurement to get reasonable
precision for our own delay code.

Print a measurement for a delay of 4x the OS timer resolution.

Be precise about how bad the deviation was if we had to recalculate.

Tested on Windows XP, 32 bit, built using MinGW by Uwe. Tested on
FreeDOS v1.0 Final, 32bit, built using DJGPP 4.3.2 by Idwer.

Corresponding to flashrom svn r1028.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Idwer Vollering <vidwer+lists.flashrom@gmail.com>