[U-Boot-Users] Can U-boot support CFI and None CFI devices on the same board

Rui Sousa rui.sousa at laposte.net
Mon Nov 27 23:44:07 CET 2006

On Thursday 23 November 2006 14:42, Yotam Admon wrote:
> Hi,
> I use U-Boot (1.1.4) and try to work with AM29LV040B (AMD None CFI
> Flash) in addition to known CFI flash devices (AMD, Intel, MXIC, SST).
> Does anyone have a way to integrate the CFI deriver with none CFI
> devices?

Hi Yotam,

What I did in our local U-boot version was(*):

1. Add a cfi_ prefix to flash functions in drivers/cfi_flash.c:
flash_init --> cfi_flash_init
flash_erase --> cfi_flash_erase
write_buff--> cfi_write_buff

2. Change flash base address table, in drivers/cfi_flash.c also:
flash_info_t flash_info --> extern flash_info_t flash_info

3. Create in our board specific directory a flash.c file with all the flash 
interface functions and the declaration of flash_info:
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
4. From my flash_init() I call cfi_flash_init() first. This will change the 
flash_id for all CFI compatible flashes in the flash_info table.

5. For all other flash types I use my own flash driver(s).

6. flash_erase(), for example, then looks like this:
if (info->flash_id == FLASH_MAN_CFI)
                return cfi_flash_erase(info, s_first, s_last);
	/ * call my flash driver specific flash_erase */

> Thanks,
> Yotam

I hope the helps you,

*) I don't see a way for this to be merged into U-boot any time soon since it 
implies changes for all boards using the CFI driver.

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