Re: [lm-sensors] NCT6776 on ASRock Z77 Pro4-M

[Guenter Roeck <linux@roeck-us.net>]

On 02/05/2015 12:48 PM, eaut wrote:
> Hello,
>
> When I recently started to use UEFI "Ultra-FastBoot" on a ASRock Z77 Pro4-M
> board I discovered that fans 3-5 were suddenly missing. After booting in
> Fast or Normal mode the fans were showing up correctly again. So obviously
> a firmware bug.
>
> After some googling and reading of the Nuvoton NCT6776 data sheet I came
> up with the following fix:
>
>      # enter NCT6776 "Extended Function Mode"
>      isaset -y 0x2e 0x2e 0x87 0x87
>      # select logical device HW-MONITOR
>      isaset -y 0x2e 0x2f 0x07 0x0b
>      # enable fans 3-5 by setting bits 5-7 in reg 0x30
>      isaset -y 0x2e 0x2f 0x30 0xe0 0xe0
>
> In the process I have created a small script to list all the NCT6776 fan
> related settings and optionally all NCT6776 GPIO registers. Hopefully it
> will save someone else the time I had to spend on this issue.
>
> https://github.com/eaut/nct6776/blob/master/nct6776-fanpin-info.sh
>
> Since quite a few mainboards seem to have firmware related register
> initialization issues wouldn't it make sense to add an optional module
> parameter to be able to override register settings when loading the nct6775
> driver module?
>
> Example:
>
>         ldev reg  val  mask
> setreg=0x0b,0x30,0xe0,0xe0,next-sequence,...
>

I would not want to risk that, but I am not adverse to add code which
configures the registers as needed for specific mainboards.

What is the exact DMI information for your board (Vendor and board name) ?

Thanks,
Guenter


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