[lwip-users] An external filesystem for httpd

[Giuseppe Modugno]

Until now, I was using the embedded fs generated by the tool makefsdata. 
Unfortunately the filesystem I'd like to create is bigger than the 
internal Flash memory of the MCU.

I'm thinking to use an external SPI Flash memory to save the filesystem. 
So I need another tool that creates an ouput binary (or Intel Hex) image 
file to save directly in the SPI Flash memory. I know I can write this 
tool completely myself, but I'm sure there are some good examples to 
look at.
Also I need some source code to access this filesystem over SPI (open 
file, read 100 bytes, and so on).

I think I can use the FAT filesystem, however I think it is over 
complicated respect what I need to do.

Actually httpd automatically search for files in fsdata data structure 
(that is a linked list). With an external file system, I think I have to 
consider every file as a custom file. I'm in doubt if it's better to 
read immediately the content from external Flash in 
fs_read_async_custom() (blocking until all data are ready), or start a 
background (non-blocking) process that reads from external SPI Flash and 
signals when it ends.

Any suggestions?