Dear Stefan Roese,
as Wolfgang Denx suggested me, i am trying to use the u-boot CFI driver with a CFI flash (SSTVF3201B).
Yes. But please take a look at the CONFIG_FLASH_CFI_LEGACY config option. This enables the legacy CFI flash devices. And IIRC the SST flash chips are supported via this driver/extension.
This flash chip allows erasing/writing blocks of 4 KBytes (called "sectors" in the SST datasheet), or 64 KBytes (called "blocks").
The command sequence table for this flash shows 2 different commands to >
Please see my comment above. And grep for CONFIG_FLASH_CFI_LEGACY to see how its used in the config header. And if necessary, you can always extend the CFI configuration in the JEDEC source:
drivers/mtd/jedec_flash.c
thaks for the hint, anyway seems i am unfortunate whit this flash chip:
first of all, i would understand why a flash chip is defined/handled as leagacy. Can someone kindly clarify this ? SST39VF3201B is a 2M x 16, CFI compliant.
CFI legacy dont seems anyway to support 0x50 command for erasing a sector, i grepped and found "only" a CMD_CLEAR_STATUS as 0x50 that don't seems to fit the case. But the code is not trivial, and i can miss something of course.
Also, legacy flash_info_t don't have any field to define the erase sector command. But still, i am not sure this chip should be considered legacy.
I grepped for *3201* SST chip, only baord that seems to use it is
esd/common
and this board has her own flash.c
But still, has been suggested me to use CFI driver, so i need to know what the u-boot community would prefer as approach.
Still a note. I found issues in Linux also for this chip (STT39VF3201B) and had to ask for a patch on the command set to allow the correct erase command to be used.
So how should i proceed ?
Many thanks.
Best Regards Angelo Dureghello