[U-Boot-Users] " Configuring Flash on PPC405ep board"

[U-Boot-Users] " Configuring Flash on PPC405ep board"

[nreddy at netenrich.com]

Hi All,

I need to know how to configure 8MB Flash on PPC405ep board.
I already have 4MB flash on PPC405ep board working fine .
I am using u-boot as my bootloader.

Can anybody tell me what are the registers to be configured at Processor
side(i am new to this register settings) or memory controller side.

Please tell me the steps that i need to follow to write my own dirver(i
may take existing driver as reference).

Thanks in Advance,
--Nagi

[U-Boot-Users] " Configuring Flash on PPC405ep board"

[Bharathi Subramanian]

On Fri, 23 Sep 2005 nreddy at netenrich.com wrote:

> I need to know how to configure 8MB Flash on PPC405ep board.

To detect the new flash, You have add the Manufacture and Device ID
(check the data sheet) of the new flash in the following function:

File : ./board/bubinga405ep/flash.c
Func : flash_get_size()

Bye :)
-- 
Bharathi S

[U-Boot-Users] " Configuring Flash on PPC405ep board"

[Stefan Roese]

Hi Nagi,

On Friday 23 September 2005 12:09, nreddy at netenrich.com wrote:
> I need to know how to configure 8MB Flash on PPC405ep board.
> I already have 4MB flash on PPC405ep board working fine .
> I am using u-boot as my bootloader.

That's good. If not, your mail would be pretty wrong here in this list! ;-)

> Can anybody tell me what are the registers to be configured at Processor
> side(i am new to this register settings) or memory controller side.

If you are lucky, you "only" have to change the EBC (external bus controller) 
setup for the corresponding CS (chip select). Please see e.g. below some 
lines from the bubinga (AMCC 405EP eval board) config file 
(include/configs/bubinga.h):

/* Memory Bank 0 (Flash/SRAM) initialization                                    
*/
#define CFG_EBC_PB0AP           0x04006000
#define CFG_EBC_PB0CR           0xFFF18000  /* BAS=0xFFF,BS=1MB,BU=R/W,BW=8bit  
*/

To change the size of this CS0 setup, you need to change the BAS field and the 
BS field. E.g. to something like this:

#define CFG_EBC_PB0CR           0xFF8E8000  /* BAS=0xFF8,BS=8MB,BU=R/W,BW=8bit  

But I would suggest that you take a look at the 405EP user's manual to check 
yourself. It's not that complicated.

Now you (hopefully) have the CS setup correctly, but you also have to 
configure/change your flash driver to support this new flash. Do you use the 
common CFI driver? Or a board specific version?

> Please tell me the steps that i need to follow to write my own dirver(i
> may take existing driver as reference).

Best regards,
Stefan

[U-Boot-Users] ' Configuring Flash on PPC405ep board'

[nreddy at netenrich.com]

Hi Stefan,

Thanks for your suggestion.


I enabled 8MB flash on my board.
It started working now.
Still i need to check thoroughly.

I have taken reference driver from /board/walnut405 .

Thanks once again.

Thanks,
--Nagi


> Hi Nagi,
>
> On Friday 23 September 2005 12:09, nreddy at netenrich.com wrote:
>> I need to know how to configure 8MB Flash on PPC405ep board.
>> I already have 4MB flash on PPC405ep board working fine .
>> I am using u-boot as my bootloader.
>
> That's good. If not, your mail would be pretty wrong here in this list!
> ;-)
>
>> Can anybody tell me what are the registers to be configured at Processor
>> side(i am new to this register settings) or memory controller side.
>
> If you are lucky, you "only" have to change the EBC (external bus
> controller)
> setup for the corresponding CS (chip select). Please see e.g. below some
> lines from the bubinga (AMCC 405EP eval board) config file
> (include/configs/bubinga.h):
>
> /* Memory Bank 0 (Flash/SRAM) initialization
> */
> #define CFG_EBC_PB0AP           0x04006000
> #define CFG_EBC_PB0CR           0xFFF18000  /*
> BAS=0xFFF,BS=1MB,BU=R/W,BW=8bit
> */
>
> To change the size of this CS0 setup, you need to change the BAS field and
> the
> BS field. E.g. to something like this:
>
> #define CFG_EBC_PB0CR           0xFF8E8000  /*
> BAS=0xFF8,BS=8MB,BU=R/W,BW=8bit
>
> But I would suggest that you take a look at the 405EP user's manual to
> check
> yourself. It's not that complicated.
>
> Now you (hopefully) have the CS setup correctly, but you also have to
> configure/change your flash driver to support this new flash. Do you use
> the
> common CFI driver? Or a board specific version?
>
>> Please tell me the steps that i need to follow to write my own dirver(i
>> may take existing driver as reference).
>
> Best regards,
> Stefan
>

[U-Boot-Users] " Configuring Flash on PPC405ep board"

[Matthias Fuchs]

Hi Nagi,

 > I need to know how to configure 8MB Flash on PPC405ep board.
 > I already have 4MB flash on PPC405ep board working fine .

take a look at the VOM405 board. It's a 405EP board with 8MB NOR-Flash.

Regards
Matthias