52277 IPSBAR

[ianlovatt]

in MCF52277RM.pdf section 1.4 Memory Map Overview says IPS is at F000_0000h

yet the .lcf from an example project that came with the 52277EVB has the following:

# MCF52277 Derivative Memory map definitions from linker command files:
# __IPSBAR, __RAMBAR, __RAMBAR_SIZE, __FLASHBAR, __FLASHBAR_SIZE linker
# symbols must be defined in the linker command file.

# Memory Mapped Registers (IPSBAR= 0x40000000)
 ___IPSBAR         = 0x40000000;

4000_0000 is the same address as the external DDR. I'm not experiencing any problems so I think i've just misunderstood something .

Can anyone explain to me why IPSBAR and the external DDR seem to be mapped to the same address space?

thanks

ian

[ianlovatt]

I think this might come down to more misleading code for the 52277 example projects (that came on EVB CD). Looking through the MCF52277RM, there isn't an IPSBAR reg whereas on other V2s there is (52259 does have one it seems). I've previously been perplexed by the memory sizes given in an example project's lcf not matching the 52277.

Can anyone confirm that the IPS is fixed on the MCF52277 at F000_0000h so I won't need to worry about initialising it ever?

thanks

ian