[FS#3471] Mikrotik RB911-5Hn propper nand detection failed

[OpenWrt Bugs]

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FS#3471 - Mikrotik RB911-5Hn propper nand detection failed
User who did this - Alexandros C. Couloumbis (acoul)

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Hi Roger,

// If the new sysfs driver is not working in ar71xx with your device and it was working before, this is a regression. Since this bug report has gotten very long, you may want to open a new one specifically for that. Otherwise, it will be a nightmare for Thibaut (or whoever can fix it) to understand what was going on here. //

//
>From my experience, I once wiped the calibration data of an ath9k radio in a NanoStation and just copy&pasting the caldata from other NanoStations did not work well. The radio worked, but speeds and distance range were very low. Fortunately I found a backup of the flash chip and could recover it.//

if I understand correctly, if ath9k can't find the wlan calibration data, it aboarts loading for that wifi. so if ath9k loads & the wlan is visible, that means that the wlan calibration data was located & loaded successfully.

openwrt-18.x loads ath9k & also offers a wlan calibration data file under the /sys/firmware directory

openwrt-19.x, ar71xx loads ath9k but there is no wlan calibration data file under the /sys/firmware directory (not even the 0 byte one). somehow though, ath9k is able to locate the art partition & load the relative data

the ath9k loading process, from the above looks like is independent from the process of exposing this data under /sys/firmware. am I right ?

the above, just for the record.

as for the ath79/trunk, my rb911-5HnD-nand is working rock stable @ the rooftop thanks to your help. I really hope this work gets into the openwrt mainline since these devices are still sold & they are quite cool & inexpensive.

Finally, I do have an rb411, an rb433 & an rb711 that are still not supported under the ath79. if you are up-to giving them some shots, let me know & I will open new tickets accordingly.

cheers
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3471#comment9154

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