Date: Wed, 22 Nov 2017 02:08:14 -0500 From: Farhan Khan <khanzf@gmail.com> To: freebsd-hackers@freebsd.org Subject: Is ddb(4) over a USB-to-Serial port possible? Message-ID: <11ce9826-f768-3ea0-547d-2d182d1552f0@gmail.com>
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Hi all I am reading here in section "10.5, On-Line Kernel Debugging User Remote GDB" that you can run ddb(4) over a serial cable. I am interested in setting this up. My development box does not have a serial port (however, I do see a uart0 device in the kernel messages), so I attached a USB serial port attached to a machine with a serial port. The device uses the uslcom(4) driver and is listed as "Silicon Labs CP2102 USB to UART Bridge Controller". When I enter ddb and enter "gdb" I receive the error "The remote GDB backend could not be selected." The hint.uart.0.port in /boot/device.hints is still set to 0x3F8, which corresponds to the aforementioned kernel messages. I am not certain if this is the same port as the USB-based serial port. Does this feature work over USB? Thanks, Farhan Khan
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