[PATCH 0/4] RFC: ath79: add support for Mikrotik RB91xG

[Koen Vandeputte]

On 12.05.21 14:47, Bjørn Mork wrote:
> Koen Vandeputte <koen.vandeputte at citymesh.com> writes:
>
>> I've fixed most of the open stuff, with the exception of using a PCIe
>> device in the slot. (checking currently what is wrong there)
> Are you sure that's supported?  This is a slot intended only for LTE
> modems, isn't it?
>
> Looking at the picture at https://i.mt.lv/cdn/rb_images/884_hi_res.png I
> can't see anything connecting to the PETn0/PETp0 pair.  There are
> connections to the PERn0/PERp0 pair, but the traces do not look like
> they're laid out for a PCIe differential pair. I suspect that's made for
> some specific modem, using those pins for a debug UART. Like the Quectel
> EC25:
> https://forums.quectel.com/t/issue-in-interfacing-unilec-board-with-quectel-ec-25-e-mini-pcie-card/3057/5
>
>
>
>
> Bjørn

Hi Bjørn

I can confirm the slot can also handle pcie signaling.
Got a rb912 board laying on my desk this very moment running an extra 
ath9k pcie card :-)  (openwrt 19.07)

The slot is also advertised by MikroTik that it can do that.

Here is a part of a rb912 bootlog, running in the field:


[   14.008974] ath: EEPROM regdomain: 0x0
[   14.008986] ath: EEPROM indicates default country code should be used
[   14.008990] ath: doing EEPROM country->regdmn map search
[   14.009008] ath: country maps to regdmn code: 0x3a
[   14.009014] ath: Country alpha2 being used: US
[   14.009018] ath: Regpair used: 0x3a
[   14.025334] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   14.027550] ieee80211 phy0: Atheros AR9340 Rev:3 mem=0xb8100000, irq=47

[   14.034690] pci 0000:00:00.0: using irq 40 for pin 1
[   14.039934] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[   14.054898] ath: EEPROM regdomain: 0x0
[   14.054906] ath: EEPROM indicates default country code should be used
[   14.054910] ath: doing EEPROM country->regdmn map search
[   14.054928] ath: country maps to regdmn code: 0x3a
[   14.054935] ath: Country alpha2 being used: US
[   14.054939] ath: Regpair used: 0x3a
[   14.068383] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   14.070596] ieee80211 phy1: Atheros AR9300 Rev:4 mem=0xb0000000, irq=40


Regards,

Koen