Artesyn COMX-P2020 Installation and Use (February 2015) - Manual (Page 78)

Functional Description
COMX-P2020 Module Installation and Use (6806800K97E) 78
4.3.2 SD Card
COMX-P2020 COM Express Module has a microSD card slot on-module with a 2 GB SD card
installed. The SD card stores the Bootloader and the Operating System.
The eSDHC acts as a bridge, passing host bus transactions to SD/MMC cards by sending
commands and performing data accesses to or from the cards. It handles the SD/MMC
protocol at the transmission level.
4.3.3 SPI Flash
COMX-P2020 COM Express Module has an SPI socket on-module with a 4 MB SPI Flash
installed. The U-Boot is installed in the SPI flash on module.
The flash was divided into 3 areas: configure data, U-boot, and Environment argument area.
Figure 4-3 SPI Area for U-boot