On Tuesday 01 February 2005 20.06, Jerry Van Baren wrote:
Wolfgang Denk wrote:
Dear Thomas,
in message
D9F0B2AD4531B0449D51C1F09199D484050E72@mail.kom-saarbruecken.com you wrote:
Yes, I know that this has been discussed recently and the recommendation is to store the environment in flash, but:
Indeed.
[snip]
- Are there conditions known to cause similar effects with flash chips
as described for EEPROM devices? Could power loss or similar conditions
No.
when writing environment sectors cause a flash device to destroy other sectors than the just written one?
In theory yes. You could assume a system without power monitoring where the power is failing slowly so that at some point during the brownout the CPU migth start executing bogus insructions, or that some bus driver corrupts the addresses or data, or... In theory anything can happen.
Best regards,
Wolfgang Denk
Flash corruption is more than in theory: proper hardware design is to have a power fail warning sufficient to allow a flash write cycle to complete before power completely fails and your software should not write to the flash when the power fail warning is active.
I assume this is true for all flash CHIPS and not only higher level assemblies like Compact Flash (that I read can be destroyed if written to when power fails)
/RogerL