[LinuxBIOS] Nifty device for SPI chips
bari at onelabs.com
Mon Apr 30 17:27:36 CEST 2007
Richard Smith wrote:
> I just got back from an extended stay in Asia and while I was there was
> introduced to a nifty little device for SPI flash chips. When the mfgs
> all switch to SPI it may actually be much easier to deal with non-socket
> $275 US gets you a programmer + the hardware to hook it up to your board.
> The way it works is by asserting the HOLD pin on the SPI flash which
> almost all SPI flash parts have. So the flash thats soldered on board
> is suspended and you boot from the one in the adapter.
> The only requirement is to have the HOLD pin pulled up via a resistor
> rather than tied directly to the SPI part's Vcc. Even if it is tied
> directly to Vcc working around it would only involve cutting a single
> trace or lifting the HOLD pin.
This is what I started working on with the PLAICE project
http://flash-plaice.wikispaces.com. Looks like about the same features
only we add a logic analyzer to the mix for under $200.
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