Hi Pelle, On 9/2/20, Pelle Windestam <pelle.windes...@tagmaster.com> wrote: > Hi everyone, > > Is there any support for high capacity SD-cards in NuttX, i.e. larger than > 32GB? I have done some research online and it seems that for those sizes, > SDXC cards using the exFAT file system is required. I have looked through > the code and cannot find anything indicating support for either SDXC or > exFAT. But I thought I would check in with you guys in case I am missing > something. >
AFAIK there is not support to SDXC neither exFAT on NuttX. Although there exist exFAT support on Linux kernel introduced around version 5.4, I think exFAT is covered by Patents, so it could be an issue. It appears you need to be part of OIN (Open Invention Network) to get rid of patent issues: https://www.techradar.com/news/microsoft-is-bringing-its-exfat-patents-to-linux-and-open-source So, instead of discussing how you could implement it, I want to asked you: "Why do you want SDXC and exFAT at first place?" Perhaps you could say you want a low cost and big storage solution. If this is the case, take a look at eMMC option. Ivan from Barin Sports used this solution in their product and I think it better option for big storage, low cost and will avoid you facing some issues with the Microsoft in the future. BTW, if you still thinking about exFAT on NuttX, you should implement it following the specification (https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification) or if you don't have issue releasing all your company code as GPL, you can port the exfat-linux project: https://github.com/arter97/exfat-linux BR, Alan
