ramdisk size is larger than 4MB

[Shawn Jin]

>> It should be fine to just change it locally.  It would be a problem to
>> change it upstream for all boards, since some supported boards have
>> only 16MB (or even 8MB) of RAM.
>
> I'll definitely try to change it locally first. Would a configurable
> base address for the bootwrapper an acceptable solution?

I found the link_address in the wrapper shell script sets the _start
address. But after changing it to 0x800000, the kernel failed to boot,
shown below. There must be something also needs proper adjustment.
What would that be?

=> bootm 4000000
## Booting image at 04000000 ...
   Image Name:   Linux-2.6.33.5
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1757356 Bytes =  1.7 MB
   Load Address: 00800000
   Entry Point:  00800554
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
Memory <- <0x0 0x8000000> (128MB)
ENET0: local-mac-address <- 00:09:9b:01:58:64
CPU clock-frequency <- 0x7270e00 (120MHz)
CPU timebase-frequency <- 0x7270e0 (8MHz)
CPU bus-frequency <- 0x3938700 (60MHz)

zImage starting: loaded at 0x00800000 (sp: 0x07d1cbd0)
Allocating 0x3a15a4 bytes for kernel ...
gunzipping (0x00000000 <- 0x0080c000:0x00bd702c)...done 0x3886ec bytes

Linux/PowerPC load: root=/dev/ram
Finalizing device tree... flat tree at 0xbe4300

Thanks a lot,
-Shawn.