I have problems initializing the internal SRAM.
I rtfm and followed the steps described in Chapter 6.2.3 SRAM Initialization Code.
When I connect to my target via the BDI2000-interface by Abatron I have immediate access to SRAM as it is configured via the interface. They don't do anything different than me: write 0x20000001 to RAMBAR-register. But if I initialize the SRAM in my code, writing to RAMBAR has no effect.
This is what I do:
INT_SRAM_BASE EQU $20000000 ; Base add used for internal SRAM INT_SRAM_SIZE EQU $00010000 ; MCF5235 has 64K internal SRAM INT_SRAM_VALID EQU $20000001 ; Bit to make internal SRAM ; valid/enabled. MOVE.W #LOCKOUT,SR ; Lock-out interrupts MOVE.L #INT_SRAM_VALID,D0 MOVEC.L D0,RAMBAR0; zero SRAM lea.l INT_SRAM_BASE,A0 move.l #INT_SRAM_SIZE,D0SRAM_INIT_LOOP: clr.b (A0)+ subq.l #1,D0 bne.b SRAM_INIT_LOOP; Init VBR MOVE.L #VECTOR_BASE,A0 MOVEC A0,VBR; Init IPSBAR MOVE.L #IPSBAR,A0 MOVE.L #IPSBAR_VALUE,(A0)
Can someone give me a hint on that, please?
Thanks in advance