[U-Boot-Users] output to serial console stops after uncompressing kernel

[Midhun Agnihotram]

Hi All,

   We are using Cogent CSB535FS board running Freescale's i.MX21 with
U-Boot. We have downloaded the updated linux kernel 2.6.16 from the
Microcross site (supposedly patched for the board). The load address
and entry address are set to C0600000. And the image is downloaded to
C0200000. When we run the bootm command, the kernel unzips but there
are no messages on the serial console. The screen buffer dump is as
follows:

U-Boot 1.2.0 (Jun  4 2007 - 16:32:54)

BOARD: Cogent CSB535FS
DRAM:  64 MB
Flash:  8 MB
In:    serial
Out:   serial
Err:   serial
=> loadb C0200000
## Ready for binary (kermit) download to 0xC0200000 at 115200 bps...
----------------------------------------------------
C-Kermit>send /BINARY linux-2.6.16/arch/arm/boot/uImage
C-Kermit>connect
Connecting to /dev/ttyS0, speed 115200
 Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------
## Total Size      = 0x000f8a5c = 1018460 Bytes
## Start Addr      = 0xC0200000
=> bootm C0200000
## Booting image at c0200000 ...
   Image Name:   Linux-2.6.16-csb
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1018396 Bytes = 994.5 kB
   Load Address: c0600000
   Entry Point:  c0600000
   Verifying Checksum ... OK
OK

Starting kernel ...

ArchID=0x000002a3
output_data: 0xc0008000
Uncompressing Linux....................................................................
done, booting the kernel.


   There are no further messages printed on the serial console after
the above line. However, the LCD on the board seems to have
initialized (kernel configuration also had framebuffer support) and
the penguin logo is displayed on the LCD.

   We tried changing baud rate but that did not solve the problem. The
boot arguments are just the ones setup as default by U-Boot
(bootargs=mem=32M console=ttyS0,115200 root=/dev/nfs rw
init=/sbin/init ip=on). We have not provided any filesystem yet
because we wanted to see output until the filesystem error.

   What could be the problem?

Thanks,
Midhun.