Quote from: pekatete on February 01, 2015, 12:23:58 PM

S5 firmware fan speed mods .....

I stumbled accross this topic https://bitcointalk.org/index.php?topic=940250 where they had a mod for the S4, and thought about making a firmware mod for the S5, in the process, the person who made the original mod to the module controlling the S4 fan has come up with a mod for the S5. Here's the link to the message: https://bitcointalk.org/index.php?topic=940250.msg10327889#msg10327889

I have not tested the firmware as I received my S5 with the stock fan DOA (got in touch with bitmain and they want me to take videos of it and / or buy something from them before ... blah blah ... for another day that one!). If anyone is willing to give the modded firmware, please give it a go and provide feedback. there are links on the messaage, but I'll reproduce them below too:

1. fan_6 - slower than stock - https://mega.co.nz/#!MVtHXBKC!VEymK0FxLpuXTl5ZpxnNxlQNKOsp15V0vRy18Vb7dPI
2. fan_3 - slower than fan_6 - https://mega.co.nz/#!JFNnQALR!3x501jLm1GyzUlDMZ4USWGmDHYCyZKSSiNp4UWRWUnM
3. stock firmware (also on bitmain site) - https://mega.co.nz/#!1ENCRYIb!pbSf4wXt4nwX_0IYTH1LRh0mZ9_Gw3KgbCel8zyhOjo

If you try the firmware, please provide feedback either here or on the thread linked above to lanfeusst. This mod can also be the pilot for a permanent mod for updating cgminer et al!

Since nothing survives a reboot on a S5, you'll have to do this a little different than the S4 to test without repacking the firmware.

To use it :
Change 192.168.0.16 with the Ip address of your miner

scp bitmain_spi_fan_6.ko root@192.168.0.16:/lib/modules/3.8.13/kernel/drivers/bitmain/ #Copy the file to the miner

then ssh to the miner :
ssh root@192.168.0.16
then :
cp /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko /config/bitmain_spi_original.ko #Makes a backup
cp /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi_fan_6.ko /lib/modules/3.8.13/kernel/drivers/bitmain/bitmain_spi.ko # Copy the new file to the good place
cd /etc/init.d/ #Change directories
./cgminer.sh restart # Restart cgminer

I've tested both files:

Ambient temps here today are -5 C & I'm running 9 miners in this rack.
bitmain_spi_s5_fan_6.ko runs the fans at 3240 RPM and temps are averaging 56 C
bitmain_spi_s5_fan_3.ko runs the fans at 2760 RPM and temps are averaging 66 C