[U-Boot-Users] "Transferring control to Linux" hangs

[Gil Madar]

Hi,

I work on an MPC866 board at home, with no emulator, and I use puts() and
blinking leds on my board to debug the boot process.
I know it is not supported, but U-boot is loaded by a pSOS bootrom by tftp,
but that's not the problem.

If I put a call to my 'void leds_blink( void )' routine one line before the
'(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);' call
line at 'do_bootm_linux()', I see the leds blink continuously.

I inserted the same 'leds_blink()' code into the Linux-2.4.25 code tree
downloaded from www.denx.de.
I also inserted an 'extern' declaration in head_8xx.S.
I perform a 'b leds_blink' as the first command in _start, just to but I see
no blinking.
I made sure head_8xx.o is used in the link, and ran 'nm' to make sure
'leds_blink' is used in it.
I saw no compilation/link errors during kernel compilation.

Can somebody advise what more can be checked?

TNX,
Gil

I attached the console printouts.
----------------------------------------------------------------------------
----------
U-Boot 1.1.2 (Oct 29 2005 - 23:22:08)

CPU:   unknown MPC86x (0x08010004) at 133 MHz: 16 kB I-Cache 8 kB D-Cache 
FEC present
          *** Warning: CPU Core has Silicon Bugs -- Check the Errata ***
Board: IDU()
DRAM:  16 MB
Top of RAM usable for U-Boot at: 01000000
Reserving 129k for U-Boot at: 00fdf000
Reserving 260k for malloc() at: 00f9e000
Reserving 60 Bytes for Board Info at: 00f9dfc4
Reserving 48 Bytes for Global Data at: 00f9df94
Stack Pointer at: 00f9df78
New Stack Pointer is: 00f9df78
Now running in RAM - U-Boot at: 00fdf000
Using default environment

In:    serial
Out:   serial
Err:   serial
U-Boot relocated to 00fdf000
Net:   FEC ETHERNET
Monitor Command Prompt:>setenv ipaddr 10.0.0.4;setenv serverip 
10.0.0.2;setenv gatewayip 10.0.0.138;setenv hostname idu;setenv bootcmd 
$nfsboot
Monitor Command Prompt:>setenv bootfile uImage;setenv rootpath 
/opt/ELDK/ppc_8xx;setenv netmask 255.0.0.0;setenv netdev fec
Monitor Command Prompt:>setenv ethaddr 00:01:02:03:04:05;setenv consoledev 
ttyS0;setenv console ttyS0,38400
Monitor Command Prompt:>tftpboot 500000 uImage
Using FEC ETHERNET device
TFTP from server 10.0.0.2; our IP address is 10.0.0.4
Filename 'uImage'.
Load address: 0x500000
Loading: #################################################################
          #################################################################
          ####
done
Bytes transferred = 684999 (a73c7 hex)
Monitor Command Prompt:>bootm 500000
## Booting image at 00500000 ...
    Image Name:   Linux-2.4.25
    Image Type:   PowerPC Linux Kernel Image (gzip compressed)
    Data Size:    684935 Bytes = 668.9 kB
    Load Address: 00000000
    Entry Point:  00000000
    Verifying Checksum ... OK
    Uncompressing Kernel Image ... OK
## Current stack ends at 0x00F9DBB0 => set upper limit to 0x00800000
## cmdline at 0x007FFF00 ... 0x007FFF01
memstart    = 0x00000000
memsize     = 0x01000000
flashstart  = 0x00000000
flashsize   = 0x00000000
flashoffset = 0x00000000
sramstart   = 0x00000000
sramsize    = 0x00000000
immr_base   = 0xFF000000
bootflags   = 0x00000001
intfreq     =    133 MHz
busfreq     = 66.500 MHz
ethaddr     = 00:01:02:03:04:05
IP addr     = 10.0.0.4
baudrate    =  38400 bps
No initrd
## Transferring control to Linux (at address 00000000) ...
(No more prints to the console)
----------------------------------------------------------------------------
----------