[U-Boot] Trouble running hello_world

[Alfred Morgan]

Hello clueful people, I am new to U-Boot.

I am having trouble executing anything using U-Boot.  I have read the U-Boot README and Manual.  I have also tried to following the steps on plugcomputer.org's wiki.  I was feeling like I was beginning to get a clue but then I couldn't get anything to work.  I figured a good place to start is trying to execute the u-boot hello_world standalone program but I couldn't even get that to work.

I am connected to the serial port via the GuruPlug JTAG board to my GuruPlug Server Plus and here is my output from the serial console:
U-Boot 2009.11-rc1-00602-g28a9c08-dirty (Feb 09 2010 - 18:15:21)
Marvell-Plug2L

SoC:   Kirkwood 88F6281_A0
DRAM:  512 MB
NAND:  512 MiB
In:    serial
Out:   serial
Err:   serial
Net:   egiga0, egiga1
88E1121 Initialized on egiga0
88E1121 Initialized on egiga1
Hit any key to stop autoboot:  0 
Marvell>> loads 
## Ready for S-Record download ...

## First Load Addr = 0x0C100000
## Last  Load Addr = 0x0C100249
## Total Size      = 0x0000024A = 586 Bytes
## Start Addr      = 0x0C100000
Marvell>> go 0xC100000
## Starting application at 0x0C100000 ...

And that is it.  The plug sits there with no further output to the serial console.  I've also tried "tftp 0x6400000 hello_world.bin" and "go 0x6400004" (like the manual says to start 4 bytes from start in section 5.12.1) but still, same boring results.  I've also tried 0xC100004 with the loads method just in case, but still nothing.

Am I loosing serial console output when I issue the go command?  Am I doing something wrong here?

-alfred

hello_world.srec:
S013000068656C6C6F5F776F726C642E7372656376
S3150C10000070402DE90050A0E10100A0E10160A0E1D3
S3150C100010600000EB0610A0E37C009FE5300000EBBF
S3150C100020250000EB0040A0E30010A0E16C009FE55A
S3150C1000302B0000EB68009FE5290000EB64009FE5A0
S3150C1000400510A0E1260000EB070000EA042196E754
S3150C10005054309FE5000052E30410A0E14C009FE5DC
S3150C1000600320A0011E0000EB014084E2050054E1C0
S3150C100070F5FFFFDA38009FE5190000EB120000EBD4
S3150C100080000050E3FCFFFF0A0D0000EB24009FE577
S3150C100090130000EB0000A0E37080BDE8C001100C4B
S3150C1000A0E001100CFE01100C0B02100C1602100CB9
S3150C1000B01D02100C2E02100C4702100C50C098E5A5
S3150C1000C000F09CE550C098E504F09CE550C098E50E
S3150C1000D008F09CE550C098E50CF09CE550C098E5EE
S3150C1000E010F09CE550C098E514F09CE550C098E5CE
S3150C1000F018F09CE550C098E51CF09CE550C098E5AE
S3150C10010020F09CE550C098E524F09CE550C098E58D
S3150C10011028F09CE550C098E52CF09CE550C098E56D
S3150C10012030F09CE550C098E534F09CE550C098E54D
S3150C10013038F09CE550C098E53CF09CE550C098E52D
S3150C10014040F09CE550C098E544F09CE550C098E50D
S3150C10015048F09CE550C098E54CF09CE550C098E5ED
S3150C10016050F09CE550C098E554F09CE550C098E5CD
S3150C10017058F09CE550C098E55CF09CE550C098E5AD
S3150C10018060F09CE550C098E564F09CE550C098E58D
S3150C10019068F09CE51EFF2FE118309FE5010000EA80
S3150C1001A00020A0E30120C3E40C209FE5020053E1DC
S3150C1001B0FAFFFF3A1EFF2FE14A82100C4C82100CEC
S3150C1001C04578616D706C6520657870656374732005
S3150C1001D04142492076657273696F6E2025640A0058
S3150C1001E041637475616C20552D426F6F74204142BA
S3150C1001F0492076657273696F6E2025640A0048650E
S3150C1002006C6C6F20576F726C640A00617267632096
S3150C1002103D2025640A003C4E554C4C3E00617267DD
S3150C100220765B25645D203D20222573220A004869E1
S3150C1002307420616E79206B657920746F20657869EE
S30F0C10024074202E2E2E20000A0A0040
S7050C100000DE