> On Wed, Jun 24, 2009 at 14:56:32, Young, Joseph wrote: > > > On Mon, Jun 22, 2009 at 13:16:55, Young, Joseph wrote: > > > > >> I am porting the Davinci Linux kernel to a new and similar TI > > > > >> device, called Jacinto2. I am at the point where the init > > > > >> program passed to the kernel by the bootloader is initialized. > > > > >> The problem that I am experiencing is that, whichever init > > > > >> program I pass, it can display text, but it cannot receive > > > > >> characters from the keyboard. > > > > >> > > > > >> I know the serial interface is ok, because I inserted > > > > >> prinktk's and it both issues a serial interrupt when I press > > > > >> any key, as well as retrieves the correct character from the UART > > > > >> buffer. > > > > >> However, the characters I type do not show up in the shell, and it > > > > >> doesn't seem to react to keyboard signals. > > > > >> > > > > >> When one passes /bin/sh as the init program, it will display the '# > > > > >> /' > > > > >> of the shell prompt, but the keyboard has no effect. When I > > > > >> wrote a simple 'hello world' program to print text, receive > > > > >> text from the user, and then print another line, it will print but > > > > >> not receive the keystrokes. > > > > >> > > > > >> Passing /bin/ls (which redirects to busybox) will display my > > > > >> file system as I expect, so I don't think that my busybox is broken. > > > > >> > > > > >> Is anyone familiar with how this is initialized when the kernel is > > > > >> booting? > > > > >> Does anyone have a clue what I could be missing so that the > > > > >> serial interface would record keystrokes but not pass it to the tty > > > > >> interface or shell? > > > > > > > > > > Not sure about the details of Jacinto2, but on the other SoCs > > > > > in the family, the UART TX and RX signals are > commonly mux'd with > > > > > other pins. > > > > > > > > This is correct, the UART0 TX,RX, RTS, and CTS are muxed with some GPIO > > > > pins. > > > > > > > > > Have you confirmed that all the UART signals are mux'd correctly? > > > > > > > > Yes, because the characters I type are appearing in the serial > > > > buffer on the device (I am printing out the characters received > > > > with printk's) but they are not having an impact on the console. > > > > > > > > > > I would like to guess there is something wrong with your kernel > > > configuration. Can you start from davinci_all_defconfig and then > > > modify only the parts absolutely required (like enabling > > > ARCH_DAVINCI_JACINTO2 (??)). > > > > Hmm. I tried this, using only the ARCH_JACINTO2 options, and it > > performed the same way. I think it's a problem with the tty layer > > passing the data to the shell. I don't think it's the serial layer > > because when I press a key, the serial interrupt kicks in, and if I > > add a printk to the uart_insert_char function in > > /include/linux/serial_core.h, I can print out the serial buffer, and it has > > the characters I type. I think somewhere the tty_driver or tty_buffer isn't > > getting initialized properly. > > > > How does the tty layer pass characters to user-space processes? > > > > > Also, within TI we are using filesystem from Arago project for testing > > > http://arago-project.org/files/releases/. > > > > Thanks! As soon as I can boot my RAMDISK fs, I'll start testing with > > Arago :) > > I meant to ask you to use the pre-built ramdisk image available from Arago to > eliminate any issues with the filesystem you > may be using. >
Well, I tried the Arago FS, and it still doesn't receive keyboard input. However, it provided me with additional input: ---------------------------- RAMDISK: gzip image found at block 0 EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended VFS: Mounted root (ext2 filesystem) on device 1:0. Freeing init memory: 148K uart_open(0) called ttyS0 - using backup timer *** run_init_process(/bin/sh) /bin/sh: can't access tty; job control turned off / # --------------------------- It says it can't access the tty. Is this normal when booting with a serial console through ttyS0? Thanks for your time, Joe_______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
