Support for Mikrotik Hap AC2

For Developers
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Good news, support for this board should be backported on time for OpenWrt 21.02 (see pull request). However, there is still an issue I'm investigaging, where on some boards the wifi interfaces don't work because of missing calibration data.

If you have a hap-ac2 device running on OpenWrt, it would be very helpful to:

  • describe your board (approx. date of purchase, hardware revision). For instance I have one that was bought in october 2019, has /939/r2 written on the back, and its MAC starts with 74:4D:28
  • copy-paste the partition layout from dmesg, for instance mine is:
[    0.746135] spi-nor spi0.0: w25q128jv (16384 Kbytes)
[    0.746199] 3 fixed-partitions partitions found on MTD device spi0.0
[    0.751062] Creating 3 MTD partitions on "spi0.0":
[    0.757427] 0x000000000000-0x000000080000 : "Qualcomm"
[    0.763004] 0x000000080000-0x000000100000 : "RouterBoot"
[    0.772971] 3 routerbootpart partitions found on MTD device RouterBoot
[    0.773003] Creating 3 MTD partitions on "RouterBoot":
[    0.778977] 0x00000000e000-0x00000000f000 : "hard_config"
[    0.784993] 0x000000010000-0x000000017bbc : "dtb_config"
[    0.790390] 0x00000003d000-0x00000003e000 : "soft_config"
[    0.795860] 0x000000100000-0x000001000000 : "firmware"

I'm interested to see if there is always a gap between hard_config and dtb_config, see http://lists.openwrt.org/pipermail/openwrt-devel/2021-April/034911.html for details.

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