Add external UART port YP-R0

[VanniX]

As i wrote in the other post, i already found the UART port on this player, so today i decided to bring the UART outside the player. This is very useful for kernel, mod and rom developement.

I don't re-write the entire tutorial in english (actually is not very useful, because the procedure changes for the components used), but i post the images for a graphical explanation:
http://dl.dropbox.com/u/21543264/IMG...R0_UART_00.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_01.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_02.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_03.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_04.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_05.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_06.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_07.jpg
http://dl.dropbox.com/u/21543264/IMG...R0_UART_08.jpg

At the end if all goes well the result should be similar to the following:
http://dl.dropbox.com/u/21543264/IMG...R0_UART_09.jpg


Complete tutorial (currently only in Italian):
http://www.dronix.org/forum/viewtopi...=22&t=255#p913

[Lorenz092]

Great! Indeed as I've seen before a very clean job

Anyways it should be possible also to get the serial interface from the usb, through the g_serial usb gadget...

Of course this stuff is for professionals only and some users may want an easier interface...

[VanniX]

Next step is, as you told, virtualize an UART in usb, like the android debug bridge.

[VanniX]

I simply compiled all gadget modules (scsi are required for OTG storage) from samsung sources:

  CC      drivers/scsi/ch.mod.o
  LD [M]  drivers/scsi/ch.ko
  CC      drivers/scsi/scsi_mod.mod.o
  LD [M]  drivers/scsi/scsi_mod.ko
  CC      drivers/scsi/scsi_wait_scan.mod.o
  LD [M]  drivers/scsi/scsi_wait_scan.ko
  CC      drivers/scsi/sd_mod.mod.o
  LD [M]  drivers/scsi/sd_mod.ko
  CC      drivers/scsi/sg.mod.o
  LD [M]  drivers/scsi/sg.ko
  CC      drivers/usb/gadget/arcotg_udc.mod.o
  LD [M]  drivers/usb/gadget/arcotg_udc.ko
  CC      drivers/usb/gadget/g_file_storage.mod.o
  LD [M]  drivers/usb/gadget/g_file_storage.ko
  CC      drivers/usb/gadget/g_midi.mod.o
  LD [M]  drivers/usb/gadget/g_midi.ko
  CC      drivers/usb/gadget/g_serial.mod.o
  LD [M]  drivers/usb/gadget/g_serial.ko
  CC      drivers/usb/gadget/g_zero.mod.o
  LD [M]  drivers/usb/gadget/g_zero.ko
  CC      drivers/usb/gadget/gadgetfs.mod.o
  LD [M]  drivers/usb/gadget/gadgetfs.ko

And then i loaded it without problems:

modprobe g_serial

Now serial gadget and usb otg hardware basically work, but now we need a good configuration for linux.
In player console when i connect the usb cable it write:

[  261.130000] gs_disconnect: Gadget Serial disconnected
[  261.240000] gs_setup_complete: status error, status=-108, actual=28, length=28
[  261.250000] gs_disconnect: Gadget Serial disconnected
[  261.380000] gs_setup_complete: status error, status=-108, actual=18, length=18
[  261.390000] gs_setup_complete: status error, status=-108, actual=32, length=32
[  261.400000] gs_setup_complete: status error, status=-108, actual=28, length=28
[  261.410000] gs_setup_complete: status error, status=-108, actual=4, length=4
[  261.410000] gs_set_config: Gadget Serial configured, high speed BULK config
[  261.420000] gs_setup_complete: status error, status=-108, actual=38, length=38

And.. In my thinkpad, with lsusb it shows:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 0a5c:2110 Broadcom Corp. Bluetooth Controller
Bus 005 Device 003: ID 0483:2016 SGS Thomson Microelectronics Fingerprint Reader
Bus 004 Device 008: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP210x Composite Device
Bus 001 Device 019: ID 0525:a4a6 Netchip Technology, Inc. Linux-USB Serial Gadget

This is your link, but it's useless now...
http://talk.maemo.org/showthread.php?t=23219

Like these other... http://www.mjmwired.net/kernel/Docum...serial.txt#105
http://blog.ringerc.id.au/2011/01/se...serial-on.html
http://www.armadeus.com/wiki/index.p...alk:USB_Gadget


Then i can't go on myself, i need help :P