Hi Danke, Thanks a lot at first. I've enabled the MSM_SERIAL_DEBUGGER_CONSOLE config in the kernel, and tried tty0 or ttyS0 to forward the android kernel message to my PC(Debian host), but always no joy. I guess the kernel would be stuck at the very early stage and usb drivers had not been powered by the kernel, so I got nothing.
I also have tried android emulator with my customized kernel, even the emulator UI didn't pop up, as well as the HTC stock kernel image. I don't know the reason why android emulator always loaded the prebuilt kernel, not the customized one. That was very disappointed. Regards, Jie Danke Xie wrote: > To Jie, > > You are right that when Android boots up, you will see the logo > screen, instead of the Linux console output. I guess this is what you > mean by the "tty". What Vishnu said is you won't get the kernel > messages on the LCD, but you can get it from a host PC to which you > have connected the Android device. > > When you specify the "console=<serial tty device>" in the kernel > command line (BoardConfig.mk), printk will send kernel messages to the > tty device -- if it supports the "console" functionality (not all tty > devices do; they have to call "register_console" in the driver). > > By default, just by setting console=<serial tty device> won't directly > display the kernel messages, you will need to connect the device to > the host PC (depends on the serial device, it could be a serial cable, > or USB cable), and then find the serial device on the host PC (e.g., > ttyS0 or ttyUSB1), then you can use "cat" to get the messages. > > For a quick start, I would suggest that you try "console=tty0", and > the kernel messages will be dumped to the screen, and of course, if > you only need the kernel, but not the framework for debugging, you can > comment out "service zygote" in system/core/rootdir/init.rc to prevent > the whole system from booting up. Good luck. > > Thanks, > Danke > > On Jul 14, 2:21 am, Vishnu Pratap Singh <vishu13...@gmail.com> wrote: > > set BOARD_KERNEL_CMDLINE to no_console_suspend=1 console=<Serial TTY device> > > <Baud rate of serial port> <loglevel=8> > > > > Regards > > > > On Wed, Jul 14, 2010 at 2:38 PM, Vishnu Pratap Singh > > <vishu13...@gmail.com>wrote: > > > > > > > > > > > > > Dear Jie, > > > > > Can you make clear, how you are going to boot prompt, are you using jig > > > box > > > for getting boot prompt or serial logs ? > > > > > On Wed, Jul 14, 2010 at 2:28 PM, Jie <cn.fyo...@gmail.com> wrote: > > > > >> But Tattoo device booted with a TATTOO logo screen and no ttys will > > >> appear to check out the dmesg. It seems like a paradox for android > > >> devices. > > > > >> I've changed the CMDLINE for mkbootimg command but no luck. The > > >> bootloader on HTC Tattoo hasn't been hacked so far. Any suggestions? > > > > >> PS, I'll try it on emulators. > > > > >> Regards, > > > > >> On Jul 14, 3:54 pm, Vishnu Pratap Singh <vishu13...@gmail.com> wrote: > > >> > actually if you want you can change the debug level in boot parameters > > >> also, > > >> > this should be present in your bootloader code. > > > > >> > On Wed, Jul 14, 2010 at 1:20 PM, Vishnu Pratap Singh > > >> > <vishu13...@gmail.com>wrote: > > > > >> > > yes, you can try it out. > > > > >> > > On Wed, Jul 14, 2010 at 12:24 PM, Jie <cn.fyo...@gmail.com> wrote: > > > > >> > >> Hi, vishnu > > > > >> > >> Thanks for quick reply. I've executed 'printenv' on my Tattoo > > >> > >> device, > > >> > >> 'CMDLINE' environment value isn't there. I guess it should be set in > > >> > >> BoardConfig.mk file, right? There is an item named > > >> > >> 'BOARD_KERNEL_CMDLINE' in this file. Right now, I set it to > > >> > >> 'no_console_suspend=1 console=null' as Google did for other devices. > > > > >> > >> Is this correct? > > > > >> > >> Regards, > > > > >> > >> On Jul 14, 12:10 pm, Vishnu Pratap Singh <vishu13...@gmail.com> > > >> wrote: > > >> > >> > Hi Jie, > > > > >> > >> > you can use serial port for getting the logs. on serail port go to > > >> boot > > >> > >> > prompt and there you just change the log level from 4 to 8 like > > >> below > > >> > >> > execute -> printenv > > >> > >> > it will show the environment there you will see following > > > > >> > >> > CMDLINE=console=ttySAC2,115200 loglevel=4 > > > > >> > >> > then execute > > >> > >> > setenv CMDLINE=console=ttySAC2,115200 loglevel=*8* > > >> > >> > saveenv > > >> > >> > * > > >> > >> > * > > >> > >> > reboot your target, you will get all printk logs. > > > > >> > >> > regards, > > >> > >> > vishnu > > > > >> > >> > On Wed, Jul 14, 2010 at 9:21 AM, Jie <cn.fyo...@gmail.com> wrote: > > >> > >> > > Hi, all > > > > >> > >> > > I've ported the HTC drivers for 2.6.29 to kernel-msm-2.6.32.9 on > > >> my > > >> > >> > > HTC Tattoo. After a long time debugging, I completed the > > >> compilation > > >> > >> > > without any errors. I've compared the .config files of both > > >> HTC(.29) > > >> > >> > > and android(.32.9) carefully, nothing strange was found. > > >> > >> > > However, > > >> the > > >> > >> > > phone got stuck after the new boot.img flashed and the adbd had > > >> not > > >> > >> > > started yet, so I couldn't find any useful debug messages from > > >> the new > > >> > >> > > kernel. My question is how to debug the kernel on my HTC Tattoo > > >> > >> > > without adb. Thanks a lot! > > > > >> > >> > > Regards, > > > > >> > >> > > -- > > >> > >> > > unsubscribe: > > >> > >> > > android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@go > > >> > >> > > oglegroups.com> > > >> <android-kernel%2bunsubscr...@googlegroups.com<android-kernel%252Bunsubscri > > >> b...@googlegroups.com> > > > > >> > >> <android-kernel%2bunsubscr...@googlegroups.com<android-kernel%252Bunsubscri > > >> > >> b...@googlegroups.com> > > >> <android-kernel%252bunsubscr...@googlegroups.com<android-kernel%25252Bunsub > > >> scr...@googlegroups.com> > > > > >> > >> > > website:http://groups.google.com/group/android-kernel > > > > >> > >> -- > > >> > >> unsubscribe: > > >> > >> android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@go > > >> > >> oglegroups.com> > > >> <android-kernel%2bunsubscr...@googlegroups.com<android-kernel%252Bunsubscri > > >> b...@googlegroups.com> > > > > >> > >> website:http://groups.google.com/group/android-kernel > > > > >> > > -- > > >> > > Vishnu Pratap Singh > > > > >> > -- > > >> > Vishnu Pratap Singh > > > > >> -- > > >> unsubscribe: > > >> android-kernel+unsubscr...@googlegroups.com<android-kernel%2bunsubscr...@go > > >> oglegroups.com> > > >> website:http://groups.google.com/group/android-kernel > > > > > -- > > > Vishnu Pratap Singh > > > > -- > > Vishnu Pratap Singh -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
