[ECOS] A&M Rattler board question

[Todd Smith]

I had a similar issue on a custom MPC8250 board. If I remember 
correctly, the number of memory region entries is limited (only 4 
allowed?) with the MMU on that processor.

--Todd

Richard.von.Lehe@gd-ais.com wrote:

> Has anyone had sucess defining a new memory region using an A&M 
> Rattler board?  I have used the AdderII boards prior to receiving a 
> Rattler, and have not had a problem.
>
> My technique for creating a new memory region was to change adder.S 
> and hal_aux.c as follows:
> (adder.S)
>        /* NVRAM */
>        lwi     r3,0xfc000401   # 8-bit, GPCM
>        lwi     r5,0xffff8f30
>        stw     r3,BR5(r4)
>        stw     r5,OR5(r4)
> (hal_aux.c)
> CYGARC_MEMDESC_TABLE CYGBLD_ATTRIB_WEAK = {
>    // Mapping for the Adder 85x development boards
>    CYGARC_MEMDESC_CACHE(   0xfe000000, 0x00800000 ), // ROM region
>    CYGARC_MEMDESC_NOCACHE( 0xff000000, 0x00100000 ), // MCP registers
>    CYGARC_MEMDESC_NOCACHE( 0xfd000000, 0x00008000 ), // Quad UART
>    CYGARC_MEMDESC_NOCACHE( 0xfc000000, 0x00008000 ), // NVRAM on exp 
> board
>    CYGARC_MEMDESC_NOCACHE( 0xfa000000, 0x00400000 ), // 
> Control/Status+LEDs
>    CYGARC_MEMDESC_CACHE(   CYGMEM_REGION_ram, CYGMEM_REGION_ram_SIZE 
> ), // Main memory
>
>    CYGARC_MEMDESC_TABLE_END
>
>
> When I make similar changes in rattler.S and hal_aux.c, I end up 
> segfaulting in hal_variant_
> IRQ_init. 
> (rattler.S)
>       // CS5 - NVRAM on exp board
>        lwi     r3,0xFFFF9030
>        stw     r3,CYGARC_REG_IMM_OR5(r30)
>        lwi     r3,0xFC000801
>        stw     r3,CYGARC_REG_IMM_BR5(r30)
> (hal_aux.c)
> CYGARC_MEMDESC_TABLE CYGBLD_ATTRIB_WEAK = {
>    // Mapping for the Rattler board
>    CYGARC_MEMDESC_CACHE( 0x00000000, 0x01000000 ), // Main memory 60x 
> SDRAM
>    CYGARC_MEMDESC_CACHE( 0xFE000000, 0x00800000 ), // ROM region
>    CYGARC_MEMDESC_NOCACHE( 0x80000000, 0x00100000 ), // Extended I/O
>    CYGARC_MEMDESC_NOCACHE( 0xfc000000, 0x00008000 ), // NVRAM on exp 
> board
>    CYGARC_MEMDESC_NOCACHE( 0xFF000000, 0x00100000 ), // IMMR registers
>
>    CYGARC_MEMDESC_TABLE_END
>
>
> Taking the changes out of hal_aux.c and rattler.S allows my test 
> applications to run (as long as they don't access the memory region in 
> question).  Any ideas or suggestions are welcome. 
> Regards,
> Rich
>


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