[U-Boot-Users] Add another FLASH to my board
Wolfgang Denk
wd at denx.de
Wed May 12 19:02:50 CEST 2004
In message <138e01c43831$905ea050$6b01a8c0 at cc> you wrote:
>
> I ordered a Strataflash from Intel (E28F128J3C), 128 Mbits. I would like to
> add it to the AT91RM9200 development board.
Why do you send the very same message twice within just 20 minutes?
> Is there any document to explain how to proceed to add a new flash memory in
> U-boot?
Please refer to the source code.
> To do?
Extend your flash driver to support more than one bank of flash
memory. There are many boards that do. See for example CU824 etc.
> 1. In lib_arm\board.c, I have to call a strataflash_init() routine in order
There is no such file in the U-Boot tree. No filename contains a backspace.
And no, you don't have to call strataflash_init() in lib_*/board.c; I
would reject any such modification because there is no need to modify
such a central public file just because one board adds a second bank
of flash. Also, there is no such function in the while U-Boot tree.
> to initialize the flash_info_t structure.
This must be done in your board's flash.c
> 2. call display_flash_config to print out the flash size.
Such a call is already in place. No need to care about it. Just
return the correct value from your flash_init() code.
> 3. I don't know what to do with these routines: flash_erase, write_word,
> write_buff. The content of these routines are different if we access to the
> strataflash or AT49 flash. So, how can I manage it correctly?
In your flash driver you will have to cehck which flash device gets
addressed, and branch to the right code then.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
All your people must learn before you can reach for the stars.
-- Kirk, "The Gamesters of Triskelion", stardate 3259.2
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