[U-Boot-Users] How to configure the MPC8313ERDB to support 2x128MBDDR

[Dave Liu]

<snip>
> I’m using a customized MPC8313ERDB board, which means we replaced the
> Vitesse switch with a second
> 
> Marvell PHY and we are using 64MB of NOR flash instead of 8MB.
> 
> Furthermore we added a second DDR RAM (additional 128MB) on that
> board. 

Did the second DDR RAM module use the other chip select?
If yes, you have to enable the chip select for it. 

> I adapted U-Boot (v1.3.1) to support the 64MB flash memory and the
> second Marvell PHY. This works really fine.
> 
> But I got problems when adding the second 128MB RAM module. 
> 
> I just thought I change the value of 
> #define CFG_DDR_SIZE to 256

not enough if you only change it.

> But after that I see the 128MB of the first RAM module mirrored at
> address 0x0800 0000.

> Therefore I guess there’s more configuration necessary, of course
> there is.
> I don’t know where to set the DDRLAWBAR1 to base address 0x0800 0000
> because I can’t even see 
> 
> DDRLAWBAR0 for the first 128MB RAM module. I found nothing in the
> MPC8313ERDB.h

If you are using the mpc8313erdb/sdram.c as reference, I believe the
code auto-calculate the DDRLAW (256MB).
 
> 
> Could anyone please tell me which defines I have to change or I have
> to add. Are there further changes necessary in the
> 
> board specific file sdram.c?