> /etc/hotplug.d/firmware/10-ath9k-eeprom for these routers just extracts
> 4k of calibration data from ART to bin file in /lib/firmware. I
> compared bin file to mtd area and they are identical. Why ath9k cannot
> use this data directly accessing /dev/mtd6? Is that 'mtd-cal-data' dts
> option for? If so, why does it not work in this case? (tested, ath9k
> initialization ends with error)
> I recall there was no such operation in ar71xx target and older
> kernels...

ath9k node doesn't have 'mtd-cal-data' property.
Regarding ar71xx there were special mach procedures that could
directly load caldata from mtd.

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