For a past project I had to optimize the power consumption of a battery powered device recording data on a microSD for several days.
Things you need to do or are useful to know.
Measure the power consumption profile of the application, in particular the SDCard.
The SDCard has on internal LDO (Low DropOut regulator) which turns on when you address the card ...
Seeing this I thought that surely the Official, Authentic Nintendo Memory Cards were just plain SD cards in a proprietary housing.
They aren't. The Nintendo memory cards are serial flash devices, which are accessed over SPI.
SD cards support an SPI mode, so with appropriate wiring and software, they can be accessed by a GameCube. However, the converse is ...
The W5500 is an ethernet and TCP/IP controller. OSI Model layer 4.
Short story, the W5500 is not a web server, and will never be. To get a web server, you have to run one on the STM32F4.
The advantage is that you don't have to worry about layer 4 and below.
You use the SDIO peripheral. This requires a driver. If you want the contents of the SD cards to be ...