uplcom.ko doesn't seem to recognize a USB-Serial adapter chip "Alcor Micro AU9720"

S

Shinyatti

Hello. Recently I bought an USB-Serial converter card that has “Alcor Micro AU9720” chip shown below (don’t ask me why I need serial cables nowadays).
http://www.kuroutoshikou.com/product/interface/serial_parallel/1s-lppcie_u/ (Sorry for Japanese, but you can see the specific sheet in the middle of the page.)

My Environment
OS FreeBSD 10.1-release(amd64)
Hardware hp MicroServer N57l

I googled “Alcor Micro AU9720 FreeBSD” and found uplcom.ko that mainly supports “Prolific pl2303” also does Alcor Micro AU9720 (see man uplcom).

What I did after installing the card into the box is adding
Code: 
ucom_load=“YES” uplcom_load=“YES”
to /boot/loader.conf.

Next, the output of dmesg | grep uplcom is below.
Code: 
uplcom0: <vendor 0x058f product 0x9720, class 2/0, rev 1.10/0.00, addr 2> on usbus0
uplcom0: reset failed, error=USB_ERR_STALLED
device_attach: uplcom0 attach returned 6
What does “reset failed, error=USB_ERR_STALLED” mean concretely? I want to know how to make it recognized correctly. I managed to find the code /usr/src/sys/dev/usb/uplcom.c defines how uplcom.ko acts like, but sadly I don’t have enough skill of C in reading this code.

In this connection, when I connect another USB-Serial Adapter that has “Prolific pl2303” chip in it, here's what dmesg | grep uplcom says.
Code: 
uplcom0: <vendor 0x058f product 0x9720, class 2/0, rev 1.10/0.00, addr 2> on usbus0
uplcom0: reset failed, error=USB_ERR_STALLED
device_attach: uplcom0 attach returned 6
uplcom0: <Prolific Technology Inc. USB 2.0 To COM Device, class 0/0, rev 1.10/3.00, addr 2> on usbus2
uplcom0: at uhub4, port 3, addr 2 (disconnected)
It looks like uplcom.ko recognizes Prolific pl2303 properly. In fact, I can see some new device files in /dev/ while there's no such kind of files when only Alcor one is installed.
 
Last edited by a moderator:
Shinyatti said:
Hello. Recently I bought an USB-Serial converter card that has “Alcor Micro AU9720” chip shown below(Don’t ask me why I need Serial cables nowadays).
Click to expand...
Nothing wrong with a serial connection. I use one quite frequently, a lot of older networking gear only has a serial console.

Your best bet is to get one based on the mentioned PL2303 chipset or one with FTDI, I know these work without issues. That last one should be supported by uftdi(4). There's also ubsa(4), uark(4), umcs(4) and umct(4) but I've never used one of those.
 
Yeah, it could be some variant. These chipsets seem to change a lot, without changing their type. I have two PL2303 based serial adapters, one works on Windows 7 and 8, the other doesn't. Same manufacturer, same type/model.
 
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