RE: Strataflash mapping problem

["Daly, Jeffrey" <jeffrey dot daly at intel dot com>]

i think the way it should be implemented is CYGNUM_FLASH_DEVICES should be the real number of devices on the board, CYGNUM_FLASH_WIDTH would be the 8 or 16 bit width of the particular implementation and something like CYGNUM_FLASH_BUS_WIDTH would be defined as either 8,16,32 (bits) and this would then calculate the CYGNUM_FLASH_INTERLEAVE.  so given the example in strata.h we would have CYGNUM_FLASH_BUS_WIDTH = 32 and CYGNUM_FLASH_WIDTH = 16, and with CYGNUM_FLASH_DEVICES = 2 and CYGNUM_FLASH_INTERLEAVE = CYGNUM_FLASH_BUS_WIDTH/CYGNUM_FLASH_WIDTH.  the implementation below would be CYGNUM_FLASH_WIDTH = 16, CYGNUM_FLASH_DEVICES = 4 and CYGNUM_FLASH_BUS_WIDTH = 16.  CYGNUM_FLASH_INTERLEAVE = CYGNUM_FLASH_BUS_WIDTH/CYGNUM_FLASH_WIDTH, include/flash_dev.h then defines FLASHWORD(k) as typedef cyg_uint16 flash_data_t.

> -----Original Message-----
> From: ecos-devel-owner@sources.redhat.com
> [mailto:ecos-devel-owner@sources.redhat.com]On Behalf Of 
> Enric Bel Prim
> Sent: Friday, February 13, 2004 3:48 AM
> To: 'ecos-devel@sources.redhat.com'
> Subject: Strataflash mapping problem
> 
> 
> Hi.
> I'm porting the RedBoot to a custom board similar to IXDP425 
> (with an Arm 
> Xscale IXP425 processor).
> Everything is going well except one thing: the RedBoot only 
> recognizes one 
> memory flash device.
> 
> My board has four Intel StrataFlash 28F128J3 devices (64 
> MBytes in total), 
> serially allocated (not interleaved), connected to the 
> processor expansion 
> bus 16 bits size (same as flash device bus size).
> I have selected the 'Intel StrataFlash memory support'  package to 
> implement the flash memory driver.
> I think the problem is that this driver only supports 
> interleaved memory 
> devices  (I've seen this in the file strata.h: #define 
> CYGNUM_FLASH_INTERLEAVE CYGNUM_FLASH_DEVICES ).  Is it true??
> If I define  CYGNUM_FLASH_DEVICES =(4) I get a compiler error 
> at function 
> 'flash_hwr_map_error' (I think it's about the definition of FLASHWORD 
> macro).
> If I define  CYGNUM_FLASH_DEVICES =(1) Redboot only 
> recognizes one device.
> 
> What can I do to acces the whole flash region?
> Thanks.
> 
> 
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