On Mon, Apr 17, 2017 at 9:54 PM, David Hendricks
<david.hendricks@gmail.com> wrote:
> Getting 4-byte address support in is something I'm interested in as well. In fact I have parts coming in the mail this week :-)
>
> On Mon, Apr 17, 2017 at 6:43 PM, Alex Henderson <ahenderson@aparnasystems.com> wrote:
>>
>> Hi there:
>>
>>                I just started experimenting with flashrom using a Dediprog SF600 this weekend. I noticed that there’s no support for any of the 256Mb or 512Mb SPI NOR parts (4 byte addressing an issue?).
>
>
> The Dediprog SF600 has commands for 4-byte addressing, but I was not able to get them working in the time I had to play with it. We can probably also ask Dediprog if they have an updated command spec, maybe there was a problem in the one I was looking at.
>
>>
>> Is there a newer version than 0.9.9 that I should try? I did find that the Google fork for chromeOS has a number of these parts (W25Q256, N25Q256, SST_25F256).
>
>
> Yes, but the systems those went in treated them as 16MB parts. The firmware (coreboot) is small so there wasn't really need for the extra space.
>
>>                I would be happy to try an unreleased version & report results. I can also test with an FTDI232 based programmer. The boards I can test with currently have various versions of 25q512, 25q256, 25q128 and 25q32. Functionality with the smaller parts looks good.

I'm a bit late to the party here, but in case it's relevant: I
successfully programmed a Micron N25Q512, which is a 64 MByte SPI
flash with 4-byte addressing, using patches originally from Boris
Baykov on top of a more current flashrom. See
https://github.com/skyportsystems/flashrom/commits/master .

Both FT232H module and STM32 Blue Pill board with stm32-vserprog
firmware work as programmers.