Actually, I had reviews all article about "serial console", just know I have to use LEVEL for interrupt, not EDGE. Unfortunately the default interrupt setting for kernel is with LEVEL, IRQ_SENSE_LEVEL, I think I don't need to modify it. But I found I add ASYNC_SKIP_TEST flag to UART in sandpoint.h can fix my problem.
Thanks, Johnson Cheng -----Original Message----- From: [EMAIL PROTECTED] [mailto:linuxppc-embedded-bounces at ozlabs.org] On Behalf Of Daniel Ann Sent: Wednesday, August 03, 2005 8:22 AM To: JohnsonCheng Cc: linuxppc-embedded at ozlabs.org Subject: Re: A PPC kernel issue with UART ?? Johnson, You know what? I've had the exact same problem only day or two ago. I think the mail subject was "serial console" or something similar. Have a read at it. BTW, My problem was with interrupt setting. Daniel. On 8/2/05, JohnsonCheng <johnsoncheng at qnap.com.tw> wrote: > > > Dear All, > > > > I meet a wired UART problem on linux-2.6 with MPC8241 chip. > > > > My Environment is as following: > > CPU: MPC8241 > > Linux: 2.6.12.3 > > COM1 offset: 0x4500, COM2 offset: 0x4600 > > > > When I booting my rootfs, it hangs at following message: > > RAMDISK: Compressed image found at block 0 > > VFS: Mounted root (ext2 filesystem) readonly. > > Freeing unused kernel memory: 104k init > > EXT2-fs warning: checktime reached, running e2fsck is recommended > > > > I had add printk in tty_write() of drivers/char/tty_io.c, the message from > rootfs have printed. > > The conclusion is that message can be printed by printk() in linux kernel, > but can't be printed by printf() in user mode. I think it must be something > wrong for my UART configurations, does anybody know it?? > > > > > > Best Regards, > > Johnson Cheng > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded at ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > -- Daniel _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded at ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
