Hi Angus, Yes, NuttX supports eMMC, but it depends on the driver from each MMC to support faster modes.
See the example of an issue some faced some time ago: https://lists.apache.org/thread/rf9lzwdckbkrh4l17m1lmk8tlwfqrqk9 In our company we use NuttX with an eMMC chip from SkyHigh and it works fine. BR, Alan On Fri, Oct 18, 2024 at 12:01 PM Angus Jull <angusju...@gmail.com> wrote: > Hey everyone, > > This is my first email to this forum in case you haven’t seen my name > before - I work with Matteo on CUInspace and we’re just sorting out the > choice of non-volatile storage for the rocket. > > I was trying to figure out if eMMC 4.5/5.1 is supported by NuttX. In > particular I was interested in the STM32H743 which has SDMMC ports that > support SDIO/eMMC and use them in basically the same way, seemingly just > with a difference in some configuration. That chip is marked as having > support for the SDMMC peripheral in NuttX so that makes me think it should > just work as is. I'm pretty new to SD and eMMCs and mostly new to NuttX as > well so I thought I would double check my understanding. > > Something that's confused me is the note in the "OS Components" -> "Device > Drivers" docs about MMCSD that says that only SDIO/MCI and SPI are > supported, though there's clearly been support for eMMCs in old PRs and > multiple boards. From my understanding, SDIO & the SD card protocols are > distinct from the eMMC protocol which makes me wonder if there’s > intricacies in integrating an eMMC chip. If anyone knows more about how > eMMCs fit into this driver I would be really interested in learning more. > > Best wishes, > > Angus >
