[Yaffs] Using YAFFS with an array of NOR flash.

[Michael Erickson]

Charles,

Again thanks for the reply. Does any sample code exist for a NOR device? 
Specifically, I'm wondering about the proper handling of chunks and blocks.

- Will a block of NOR flash (in my case 64K) correspond to a YAFFS block?

- When YAFFS calls the function "eraseBlockInNAND()" exported via the 
yaffsfs_DeviceConfiguration structure, is it expecting me to erase an 
entire block of NOR flash?

Thanks,
	--mikee


Charles Manning wrote:
> Many people have done YAFFS on NOR and indeed there are some shipping
> products using this.
> 
> YAFFS does not do erase suspend, so garbage collection is a bit slow.
> Still, it should be fine for testing purposes.
> Let's say you have a block size of 64kB.
> Each "chunk" needs 512 data bytes + 16 spare bytes = 528 bytes.
> Therefore each block can hold 64K/528 = 124 chunks.
> 
> So, set chunksPerBlock to 124 and away you go!
> 
> -- Charles
> 
> 
>>-----Original Message-----
>>From: yaffs-admin@stoneboat.aleph1.co.uk 
>>[mailto:yaffs-admin@stoneboat.aleph1.co.uk] On Behalf Of 
>>Michael Erickson
>>Sent: Wednesday, 12 January 2005 5:29 a.m.
>>To: yaffs@stoneboat.aleph1.co.uk
>>Subject: [Yaffs] Using YAFFS with an array of NOR flash.
>>
>>
>>Hello all,
>>
>>I am working on integrating the direct interface into our bootloader 
>>environment. Currently, I have read and write capabilities 
>>working with 
>>the RAM-disk. I want to move on to making the file system persistent 
>>across power-cycles. To do this, I want to try and use an 
>>array of NOR 
>>flash on my device. We have some NAND flash as well, but I 
>>know that the 
>>NOR interface is correct, so I want to try it first. Does anyone have 
>>any advice on how to proceed or things to look out for?
>>
>>Thanks,
>>	--mikee
>>
>>-- 
>>Michael Erickson
>>Senior Software Engineer
>>Logic Product Development
>>(612) 436-5118
>>mailto:mikee@logicpd.com
>>http://www.logicpd.com
>>
>>
>>_______________________________________________
>>yaffs mailing list
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-- 
Michael Erickson
Senior Software Engineer
Logic Product Development
(612) 436-5118
mailto:mikee@logicpd.com
http://www.logicpd.com