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

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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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Hey Roger,

//Yes, I do have the actual calibration data under /sys/firmware/mikrotik/hard_config/wlan_data//

in my case, this file is 0 bytes
  /sys/firmware/mikrotik/hard_config/wlan_data

here is the content of the /sys/firmware/mikrotik/hard_config (all files are 4096 bytes with the exception of wlan_data which is 0 bytes

  board_identifier    sxt5n
  board_product_code  911-5HnD
  board_serial    correct
  booter_version  3.10
  flash_info 0xc21020c2 0x0000000c 0x00000010 0x02000033 0x02010400
  hw_options look bellow
  mac_base   correct value
  mac_count  0x00000002
  mem_size   0x04000000
  wlan_data  0 bytes file

cat /sys/firmware/mikrotik/hard_config/hw_options
  raw		: 0x00200001
 
  no UART		: true
  has Vreg	: false
  has usb		: false
  has ATtiny	: false
  no NAND		: false
  has LCD		: false
  has POE out	: false
  has MicroSD	: false
  has SIM		: false
  has SFP		: false
  has WiFi	: true
  has TS ADC	: false
  has PLC		: false

//Does the wifi interface work?// 

yes

//Does it have the correct MAC address?//

yes

//Do you get similar RX/TX power as before (with ar71xx)?// 

currently, the only operational official ar71xx openwrt release for my 911-5HnD is 18.06.x

official ar71xx openwrt release 19.07.x has the failsafe issue

your ar71xx openwrt release 19.07.x loads ath9k & wifi looks functional but there is no calibration data under /sys/firmware

I am still trying to familiarize myself with the ath9k calibration data. it would be great, if there was a utility that could produce a comparison on performance on a wifi with & without ath9k calibration data 

finally, I also try to understand what [[https://cateee.net/lkddb/web-lkddb/ATH9K_PCI_NO_EEPROM.html|this option]] actually does, affect & offer to ath9k

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#comment9110

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