[microblaze-uclinux] Removing U-Boot, Boot Linux direct from FS-Boot

["Kenneth Schultz" <klschult@xxxxxxxxxxx>]

We are building our Linux system to boot directly from DDR as the image
will be there when FS Boot finishes booting.  Right now the last step of
FS Boot is a branch to 0x3000_0000 which is the beginning of our DDR
memory on the Xilinx platform.

I have removed the selection for enabling U-Boot as the image will
already be in DDR.

However, we are hanging.  It looks like the elf file is also hard coded
for 0x3000_0000 which it being pulled from the HW config file(I
believe).  The question I have is what other switch must I also
enable/disable in the linux build so  FS-Boot can just jump to the
address 0x3000_0000 which is the beginning of our DDR.  

One of my engineers stated that we may need to move our code up to
0x3000_8000 so the Linux load can use the space between
0x3000_0000-->0x3000_8000 for page tables, etc...  We tried that but it
looks like we get the same hang.  What am I missing?

Ken



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