[U-Boot] Is FT232R chip supported in U-Boot?
Hello All,
We have our new board and I am porting U-Boot on it. I am first trying to get U-Boot's console. FT232R is populated on the board and I need to use it for the showing the console.
I looked into u-boot/drivers/serial folder but could not find any reference to FT232R.
Could you please let me know whether FT232R is already supported in U-Boot?
Also, in case, I need to write the driver, I would like to confirm that I need to write following functions in my driver:
serial_init, serial_setbrg, serial_puts, serial_putc, serial_tstc, serial_getc
I also looked into the linux driver provided at http://www.ftdichip.com/Drivers/VCP.htm
However, I felt that the linux driver's approach to the UART handling is quite different than that of U-Boot. Could you please comment on this?
Regards, Mahavir
Am 2011-11-10 14:15, schrieb Mahavir Prasad:
Hello All,
We have our new board and I am porting U-Boot on it. I am first trying to get U-Boot's console. FT232R is populated on the board and I need to use it for the showing the console.
I looked into u-boot/drivers/serial folder but could not find any reference to FT232R.
Could you please let me know whether FT232R is already supported in U-Boot?
The U-Boot console need a real uart device, the FT232 is an USB to UART converter. The serial console needs to initialize long before the usb stack is available.
Regards,
Jens
Thanks Jonsmirl, Jen!
I revisited the schematics and saw that UART from the CPU is also going directly to a header (besides feeding the serial lines of FT232). So, first I should program the CPU's UART and get output on the header. I will worry about the FT232 later on. Hopefully, it will just work automatically because the same UART is feeding the FT232 also.
Regards, Mahavir
On Thu, Nov 10, 2011 at 7:32 PM, jonsmirl@gmail.com jonsmirl@gmail.comwrote:
On Thu, Nov 10, 2011 at 8:15 AM, Mahavir Prasad er.mahavir@gmail.com
wrote:
Hello All,
We have our new board and I am porting U-Boot on it. I am first trying to get U-Boot's console. FT232R is populated on the board and I need to use
it
for the showing the console.
If the ft232 is attached to the CPU's console serial port you don't need to do anything to it (make sure it has power and it is wired correctly) and it will work automatically assuming you program the CPU's serial port to work. Just plug the USB end of the cable into a PC and use a terminal emulation program. You need to match up the baud rates.
If it is attached the other direction - USB hooked to the CPU, then you will need to use a JTAG until you can get the USB subsystem running in u-boot.
Either way getting a JTAG going first will make like easier at the lowest level.
On Thu, Nov 10, 2011 at 7:17 PM, Jens Scharsig esw@bus-elektronik.dewrote:
Am 2011-11-10 14:15, schrieb Mahavir Prasad:
Hello All,
We have our new board and I am porting U-Boot on it. I am first trying to get U-Boot's console. FT232R is populated on the board and I need to use
it
for the showing the console.
I looked into u-boot/drivers/serial folder but could not find any
reference
to FT232R.
Could you please let me know whether FT232R is already supported in
U-Boot?
The U-Boot console need a real uart device, the FT232 is an USB to UART converter. The serial console needs to initialize long before the usb stack is available.
Regards,
Jens
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
On Thu, Nov 10, 2011 at 8:15 AM, Mahavir Prasad er.mahavir@gmail.com wrote:
Hello All,
We have our new board and I am porting U-Boot on it. I am first trying to get U-Boot's console. FT232R is populated on the board and I need to use it for the showing the console.
If the ft232 is attached to the CPU's console serial port you don't need to do anything to it (make sure it has power and it is wired correctly) and it will work automatically assuming you program the CPU's serial port to work. Just plug the USB end of the cable into a PC and use a terminal emulation program. You need to match up the baud rates.
If it is attached the other direction - USB hooked to the CPU, then you will need to use a JTAG until you can get the USB subsystem running in u-boot.
Either way getting a JTAG going first will make like easier at the lowest level.
I looked into u-boot/drivers/serial folder but could not find any reference to FT232R.
Could you please let me know whether FT232R is already supported in U-Boot?
Also, in case, I need to write the driver, I would like to confirm that I need to write following functions in my driver:
serial_init, serial_setbrg, serial_puts, serial_putc, serial_tstc, serial_getc
I also looked into the linux driver provided at http://www.ftdichip.com/Drivers/VCP.htm
However, I felt that the linux driver's approach to the UART handling is quite different than that of U-Boot. Could you please comment on this?
Regards, Mahavir
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
participants (3)
-
Jens Scharsig -
jonsmirl＠gmail.com -
Mahavir Prasad