[PATCH 1/2] kernel: usb: Autoprobe g_serial

[Linus Walleij]

Hi Chuanhong,

sorry for extreme slowness on my part, replying to an over one year old
question...

On Sun, Nov 19, 2023 at 2:27 PM Chuanhong Guo <gch981213 at gmail.com> wrote:

> The g_*.ko gadget modules conflict with each other. I think
> it isn't loaded by default to prevent that when users decided
> to install multiple of them.
>
> I made an init script to setup USB gadget using the "modern"
> configfs approach:
> https://github.com/openwrt/openwrt/pull/14005
> Maybe you can make use of this one instead? :)

So this method was merged to OpenWrt which is nice :)

I finally try to use this approach to conclude this.

I made a patch like this:

commit e4bba0549a1b474d3c0346cd1a6cb44f155c9daa (HEAD -> b4/dns313-usb-serial)
Author: Linus Walleij <linus.walleij at linaro.org>
Date:   Mon Jun 12 00:15:18 2023 +0200

    gemini: Activate serial USB console on the DNS-313

    This brings up a serial console on the USB device port of
    the DNS-313.

    Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

diff --git a/target/linux/gemini/Makefile b/target/linux/gemini/Makefile
index b2869ff72edf..ddfe67be2bb3 100644
--- a/target/linux/gemini/Makefile
+++ b/target/linux/gemini/Makefile
@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=gemini
 BOARDNAME:=Cortina Systems CS351x
-FEATURES:=squashfs pci rtc usb dt gpio display ext4 rootfs-part boot-part
+FEATURES:=squashfs pci rtc usb usbgadget dt gpio display ext4
rootfs-part boot-part
 CPU_TYPE:=fa526
 SUBTARGETS:=generic

diff --git a/target/linux/gemini/base-files/etc/inittab
b/target/linux/gemini/base-files/etc/inittab
new file mode 100644
index 000000000000..253036402d83
--- /dev/null
+++ b/target/linux/gemini/base-files/etc/inittab
@@ -0,0 +1,4 @@
+::sysinit:/etc/init.d/rcS S boot
+::shutdown:/etc/init.d/rcS K shutdown
+::askconsole:/usr/libexec/login.sh
+ttyGS0::askfirst:/usr/libexec/login.sh
diff --git a/target/linux/gemini/image/Makefile
b/target/linux/gemini/image/Makefile
index 389c8f8c442a..35250538c347 100644
--- a/target/linux/gemini/image/Makefile
+++ b/target/linux/gemini/image/Makefile
@@ -170,7 +170,7 @@ define Device/dlink_dns-313
        DEVICE_VENDOR := D-Link
        DEVICE_MODEL := DNS-313 1-Bay Network Storage Enclosure
        DEVICE_DTS := gemini-dlink-dns-313
-       DEVICE_PACKAGES := $(GEMINI_NAS_PACKAGES)
+       DEVICE_PACKAGES := $(GEMINI_NAS_PACKAGES)
kmod-usb-gadget-serial usbgadget
        BLOCKSIZE := 1k
        FILESYSTEMS := ext4
        IMAGES := factory.bin.gz


The files appear on the target, but clearly the preset dir /usr/share/usbgadget
is empty.

I realize the idea is that the target should put a config file in there.

Do you have an example of this, because currently there is no target in
OpenWrt that uses this feature...

I'm trying to figure it out.

Yours,
Linus Walleij