(No Subject)

[simon.munton at talk21.com]

Back in January, I posted a similar question about the unlock bypass mode.

Unfortunately, I've been busy on other things since then, so I've not been able to follow up on it.

The chip needs to be locked before going into the unlock bypass mode and unlocked when it comes out of this mode. It would probably be best to have a couple of helper functions to enter and exit bypass mode. 

Also, in do_write_oneword, it should skip the wait for the chip to be ready and not set the state back to ready if fast is set true.

I've also noticed that CFI_DEVICETYPE_X8 is used in several places, where it seems that cfi->device_type should be used instead (one instance is in issuing the enter bypass mode commands).

Something along the lines of the attached diff (haven't even tried compiling it, so it may be buggy)

Simon

> -----Original Message-----
> From: Brenk, Rudger van [mailto:rudger.van.brenk at intersil.com]
> Sent: 23 April 2001 2:56 pm
> To: 'mtd at infradead.org'
> Subject: Problems using fast write in cfi_cmdset_0002.c
> 
> 
> While building a uClinux environment using MTD and JFFS on an 
> AMD AM29DL323
> device (Kernel 2.0.38). I encountered some problems using the 
> cfi_cmdset_0002.c,
> when ever the fast write option is used the flash is put in a 
> 'unlock bypass
> mode' and starts writing bytes to flash. 
> 
> This is OK but in between byte writes the chip state is set 
> back to FL_READY,
> and available for other threads to access. If an other 
> threads accesses the
> flash chip it's still in 'unlock bypass mode' and will not 
> accept other
> commands/or even worse when this thread schedules out the 
> byte write program
> will continue when the device isn't anymore in 'unlock bypass mode'!!
> 
> Is there anybody else experiencing problems like this?
> 
> Thanks,
> 
> Rudger 
> 
> 
> Rudger.van.Brenk at intersil.com
> 
> 
> 
> 
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> 




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