Hi,
I'm using eCosPro with a AT91RM9200-EK board and I'm trying to set up
a connection with a radio module mapped at CS4 (Host Interface) and CS5
(DCI). For the moment my attempt is to see both CS4 and CS5 activated
on my scope. On my code I firstly configure the external bus:

HAL_WRITE_UINT32(_EBI_CFGR, (AT91C_EBI_DBPUC & 0x00) |
(AT91C_EBI_EBSEN & 0x00));

but when I try to assign the CSs my application stops

HAL_WRITE_UINT32(_EBI_CSA, _EBI_CSA & ~(_EBI_CSA_CS4A));

I thought that maybe is an MMU problem, but I don't know what I should
modify to get the application running, could someone help me? I've
already been spending some time looking for a similar problem and I
noticed that on the file hal_platform_setup.h some initialisations are
done. In particular I saw that the CS0 is assigned to flash before the
MMU is enabled, should I do the same thing with CS4 and CS5?
Thanks.

Michele

You need to modify void hal_mmu_init(void) in order to access the external memory at that location. Then if you are using RedBoot, rebuild RedBoot and reload it.

P.