On Thu, Aug 11, 2005 at 03:41:21PM -0700, Shawn Jin wrote: > Hi, > > I'm porting linux 2.6.11.4 to a custom SoC with ppc440 core. The UART > is 16550 compatible. U-Boot is already running fine. > > When the kernel is booting, it gets to the point where console_init() > is called, which calls individual early console initialization > functions. In my case it's serial8250_console_init(). Before > register_console() is called in serial8250_console_init(), everything > seems fine because the debugging logs are printed on the serial port. > But once register_console() is called, the serial port continues > spitting out ?. See the following message. What's wrong? > > Any hints are appreciated! > > Boot reached stage 4 > > Boot reached stage 5 > > Boot reached stage 6 > > OK > > Boot reached stage 7 > > Boot reached stage 8 > > ## Current stack ends at 0x01FC6B80 => set upper limit to 0x00800000 > > ## cmdline at 0x007FFF00 ... 0x007FFF10 > > bd address = 0x01FC6F90 > > memstart = 0x00000000 > > memsize = 0x02000000 > > flashstart = 0x00000000 > > flashsize = 0x00000000 > > flashoffset = 0x00000000 > > sramstart = 0x00000000 > > sramsize = 0x00000000 > > bootflags = 0x00000000 > > intfreq = 400 MHz > > busfreq = 266 MHz > > ethaddr = 00:00:00:00:00:00 > > IP addr = 0.0.0.0 > > baudrate = 115200 bps > > Boot reached stage 14 > > No initrd > > ## Transferring control to Linux (at address 00000000) ... > > Boot reached stage 15 > > id mach(): done > > MMU:enter > > MMU:hw init > > MMU:mapin > > MMU:setio > > MMU:exit > > setup_arch: enter > > setup_arch: bootmem > > arch: exit > > ??????
Try disabling early text debugging (all that "MMU:..." stuff). -- Eugene
