Thanks for the tip 
If you get to much hw errors on some chips - you may need to fine tune the scan delay multiplier in driver-bitfury.c (line 210 - between 900 and 1200) and the shift value in libbitfury.c (line 631 - between 0x100000 and 0x200000) ... I think I got them right, but they may be for my specific hardware configuration
EDIT: for per chip info check:
If you get to much hw errors on some chips - you may need to fine tune the scan delay multiplier in driver-bitfury.c (line 210 - between 900 and 1200) and the shift value in libbitfury.c (line 631 - between 0x100000 and 0x200000) ... I think I got them right, but they may be for my specific hardware configuration
EDIT: for per chip info check:
Code:
php api-example.php stats | grep -v 'stats returned' | egrep -e chip -e work -e hw -e gh -e mhz -e clock
if for some of the chips it shows different MHz on each run you will need to tweak those values above