[U-Boot] PPC440 SDRAM Chip Select

[Sinan Akman]

   Hi Amin

On 14/05/17 05:55 AM, Amin Sahebi wrote:
> Dear all,
>
> Hi,
> Regarding to my hardware restriction on routing and specific design
> considerations, I need to set SDRAM0_CFG0 , SDRAM0_CFG1 , SDRAM0_B0CR and
> probably other registers to make PPC440 to initialize SDRAM always and set
> SDRAM chip select Electrically directly to the DGND,
>
> I made some modifications on config file in BDI3000 JTAG emulator for my
> board but I have trouble with them and cannot initial the SDRAM properly:
>
> ------JTAG BDI3000 Config file for SDRAM registers------
>
> ; Setup SDRAM Controller (DDR SDRAM)
> WDCR    0x10    0x00000082    ;Select SDRAM0_CLKTR
> WDCR    0x11    0x40000000    ;CLKTR: Advance 90 degrees
> WDCR    0x10    0x00000080    ;Select SDRAM0_TR0
> WDCR    0x11    0x410a4012    ;TR0:
> WDCR    0x10    0x00000081    ;Select SDRAM0_TR1
> WDCR    0x11    0x80800840    ;TR1:
> WDCR    0x10    0x00000040    ;Select SDRAM0_B0CR
> WDCR    0x11    0x000a4001    ;B0CR:
> WDCR    0x10    0x00000030    ;Select SDRAM0_RTR
> WDCR    0x11    0x04080000    ;RTR:
> WDCR    0x10    0x00000020    ;Select SDRAM0_CFG0
> WDCR    0x11    0x04000000    ;CFG0: 32bit, PMU disable
> WDCR    0x11    0x84000000    ;CFG0: enable SDRAM
>
> -------[FLASH]----
>
> WORKSPACE   0x00004000
> CHIPSIZE    0x80000
> BUSWIDTH    8
> FORMAT      BIN 0xfff80000
> ERASE       0xfff80000  0x20000 4  ;erase 4 x 128kB
>
> I'm afraid that PPC architecture support this solution! I got this error
> when I want to program the flash:
>
> *#Programming flash memory failed at 0xfff80001 *
>
> I using PPC440EP architecture, Micron 128MB SDRAM, Yosemite AMCC evaluation
> board, BDI3000 JTAG Interface,

   I think this a bit off topic here as I don't see much relevance
to u-boot but I'd like to tell you that you don't need to initialize
your SDRAM for flash programming. Remove that WORKSPACE and make
sure you include the correct CHIPTYPE according to your flash part as 
explained in BDI3000 user manual. You will also have to make sure
CHIPSIZE and BUSWITDH reflects the board design.

   As mentioned this seems somehow off-topic here. You can e-mail
me directly with your BDI questions if you prefer.

   Hope this helps
   Regards
   Sinan Akman