On Mon, Nov 30, 2015 at 11:43 AM, Krzeminski, Marcin (Nokia - PL/Wroclaw) <marcin.krzemin...@nokia.com> wrote: > > >> -----Original Message----- >> From: EXT Peter Crosthwaite [mailto:crosthwaitepe...@gmail.com] >> Sent: Monday, November 30, 2015 7:45 PM >> To: Krzeminski, Marcin (Nokia - PL/Wroclaw) >> Cc: qemu-devel@nongnu.org >> Subject: Re: SPI EEPROM device model >> >> On Mon, Nov 30, 2015 at 12:53 AM, Krzeminski, Marcin (Nokia - >> PL/Wroclaw) <marcin.krzemin...@nokia.com> wrote: >> > Hello, >> > >> > I need to write some SPI eeprom device model (probably AT25128B or >> AT93C56). >> > I can not see any such device in qemu, but this time I want to ask >> > before I start to implement, if something that can speed up work is already >> present somewhere ? >> > Maybe do you have some preferences which eeprom device is better to >> have in qemu? >> > >> >> So some of those EEPROM devices are nearly identical to M25P80 in >> functionality, the main difference being that individual cells can be >> programmed from 0 back to 1. A quick look at a AT25128B datasheet looks >> like this may be the case. Read and write instructions as the same encoding >> as M25P80. >> >> Search m25p80 for WR_1, which is a flag you can set that allows write of 1 to >> individual bits. I think can become a feature of M25P80 (more table entries) >> if >> the basic instructions are just an M25P80 subset. >> > The goal of my question was to be sure that there is no such device model > implemented somewhere. > I target to extend M25P80 with some eeprom device, will see if this make > sense. >
Ok not that I know of beyond the WR_1 support. When I did this, it was as simple as a table entry with WR_1 to at least be good enough for the task at hand. Regards, Peter > Thanks, > Marcin > >> HTH >> >> Regards, >> Peter >> >> > Regards, >> > Marcin
