Hi,
the information on the external GPIO resetting the board of
the Zyxel GS1900-48 comes from the hardware configuration
reported by the stock firmware. It says:
GS1900# show board
[...]
====== Reset =================
Type: GPIO
GPIO: EXT_5
[...]
Using the rtk gpio commands in u-boot this can be confirmed.
Similarly the information on the XGS1250 comes from the output
of the "show tech-support" command which shows:
****************************
ZYXEL XGS1250-12
****************************
============================
Board GPIO
============================
Device Pin Direction Default Current Purpose
------- ---- ---------- -------- -------- --------
INT 0 OUT 0 0
INT 1 IN 1 1 FAN_CONTROL
INT 6 IN 1 0 HW_VER_BIT1
INT 7 IN 1 1 HW_VER_BIT0
INT 11 OUT 0 0 FAN_EN
INT 15 OUT 0 0 TX_DIS_P11
INT 16 IN 0 0 SFP_Present_P11
INT 17 IN 0 1 SFP_LOS_P11
INT 20 IN 0 0 TX_FAULT_P11
INT 21 OUT 1 1 RESET_PHY
INT 22 IN 1 1 RST_BTN_OUT
I also tested this in u-boot and toggling that output 21 definitely
only resets the PHYs (port leds turn off), not the entire board.
Cheers,
Birger
On 22/02/2022 23:00, Sander Vanheule wrote:
On Mon, 2022-02-21 at 21:23 +0100, Birger Koblitz wrote:
Hi,
I just checked with my multimeter, and while the GPIO5 on the RTL8231 does go
high/low
when I set the output high/low from Linux, my device certainly doesn't reset.
The
other
GPIO lines on the chip do work, since SFP modules are correctly detected.
Birger, just to be sure, can you confirm that your device does reset with GPIO5
on the
RTL8231?
Yes, it does.There is a warning, but then it reliably resets. That was why I
left it
in as is.
I had another hard look at my board, to check if something may be wrong
physically, but I
cannot find anything. My device's board looks identical to the pictures on the
switch wiki
[1], which I think you uploaded earlier.
There is some reset logic on the board [2], but I cannot figure out how GPIO5
would be
connected to it electrically. Unless I missed a via connecting to that pin on
the RTL8231,
GPIO5 only appears to lead to TP2. GPIO5/TP2 does not appear to be connected
electrically
to any part of the circuit next to SW1. I could add a bodge wire to connect TP2
to pad
U25:3, but gpio-restart should really work on unmodified hardware.
Does my description of the hard reset circuit on the wiki match your board?
FWIW, the GPIO description reported by the stock firmware on the XGS1250-12
claims that
internal GPIO21 can be used to reset the board, but you noted in the DTS it
actually only
resets the phy-s. So it wouldn't be the first time the reported board config is
partially
incorrect.
Best,
Sander
[1] https://svanheule.net/switches/gs1900-48#board_details
[2] https://svanheule.net/switches/gs1900-48#hard_reset_circuit
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