Hi,
On 03/31/2016 01:11 AM, David Hendricks wrote:
> On Wed, Mar 30, 2016 at 3:14 PM, Steve Miller <[email protected]
> <mailto:[email protected]>> wrote:
>
> Hi,____
>
> __ __
>
> I have the code built and running on a Raspberry PI. Unfortunately, the
> target part I am trying to program is a Micron N25Q256. I don’t see that
> part in the list. When I execute the program with –VV it seems to scan
> lots of devices. I see activity on CLK, CS, MOSI with an oscilloscope. But
> MISO remains logic low. When the program terminates, it just tells me No
> EEPROM/Flash device found.____
>
> __ __
>
> Stupid Noob Questions:____
>
> __1. __ Is the static level on MISO to be expected? Or should it
> at least toggle?
>
> You should definitely see some activity on MISO. Flashrom sends
> identification instructions (RDID, REMS, etc) to the chip and the chip should
> respond with its JEDEC-assigned manufacturer ID and vendor-specific device
> info.
>
> That said, the N25Q256 is not currently added in upstream flashrom. There is
> limited support in the Chromium branch, though.
>
> ____
>
> __2. __ Is there any hope with this device? Can I perhaps force
> it to think the chip is smaller?
>
> Yep, that's what we currently do in the Chromium branch*. The chip uses
> 24-bit addresses unless either a bit in a nonvolatile config register is set
> or alternate instructions which accept 32-bit addresses are used.
>
> *Full 4-byte address support should be ready soon, I just need to find a few
> spare cycles to finish up what I have written...
Is that any time soon ? Need some spare cycle ?
Boris Baykov already proposed a 4B patchset some time ago which I have
been maintaining for the N25Q256. Here is the port :
https://github.com/legoater/flashrom/commits/0.9.9-n25q256
Cheers,
C.
> --
> David Hendricks (dhendrix)
> Systems Software Engineer, Google Inc.
>
>
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>
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