Dear Graeme,
In message CALButCKwVh571bhgV9NQ82HYiFVJ=uGMFvVTYa5NV5M=kWvtGw@mail.gmail.com you wrote:
I have a need to dump memory contents to a filesystem on an SD/MMC card so I can transfer it to my dev PC. I don't have a working network driver, so TFTP is out
Add a network driver? :-)
Now I notice that U-Boot has code to support writing to FAT filesystems, but it does not appear to be plumbed in
Correct. (V)FAT support is read-only, like for nearly all other file systems.
Alternatively, I could patch up the recently posted ext4 code and give that a go
That would be a good idea - the more people testing that code, the better.
Is there any other existing mechanism to write a file to a filesystem on an SD/MMC card in U-Boot?
Yaffs is the only other file system in U-Boot that has write support.
If I were you, I'd try to get the ext4 code running.
Best regards,
Wolfgang Denk