Hi Alex, 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 < [email protected]> 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. > Great! We've got some pending patches for you to try, then... For the chromiumos branch, try this patch series: https://chromium-review.googlesource.com/c/323359/ (Click "Download" and then you can just checkout the full thing). For upstream, try this: https://mail.coreboot.org/pipe rmail/flashrom/2016-April/014579.html The thing to keep in mind is that there are at least three ways in which 4-byte addressing is handled, and the method depends on the chip: - The chip uses the same instructions for 3-byte and 4-byte operations, but has a status/control register bit that extends the address to 4-bytes. ("Mode 1" in my patch) - The chip has separate instructions for operations using 3-byte and 4-byte addresses. ("Mode 2" in my patch) - The chip only supports 4-byte instructions; 3-byte instructions are not even implemented (The style that Tim's patch addressed) For chromiumos: 1. Clone the flashrom repo: https://chromium.googles ource.com/chromiumos/third_party/flashrom/ 2. cd to the newly created directory (e.g. cd flashrom/) 3. Checkout the patch series: a. Go to https://chromium-review.googlesource.com/c/323359 b. Click "Download" c. Copy these the "Checkout" command and paste it into your terminal.
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