LIME on MPC5200B ioremap problem

Hello,
I have an MPC5200B with Linux and an Grafic Chip Lime on the LPB ! The Lime is configured under U-Boot und works very fine in 800x480x16 bit colors.
In Linux I adapted the Virtual Framebuffer driver! There are only three things necessary:
1: check_mem (0xE0000000, 750kB) ->thats OK
2: io__mem_request(0xE0000000, 750kB) ->thats OK , too
3_ioremap(0xE0000000, 750kB) ->thats OK , too
3: write Io request to framebuffers screen_base
The Kernel with Grafics output works fine with 800x350 resolution or 580x480 and so on.
But when I use 800x480, the screen output is OK, But the kernel crashes with custom trace stop.
I have found out that it must be a ioremap failure, because it has to do with the space i request!
It works fine if the mem_remap is under 546kB! Exactly it is not the space, but the upper adress!
Because ioremap(0xE00000860, 500kB) crashes also the Kernel!
It seems like ioremap can`t give me the adresses upper (0xE00000000+546kB)=0xE00088B80 ?
What can be the problem?
Kernel 2.6.23-rt5 with 16MB Flash and 64MB RAM

Thanks very much!

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