MSI JSPI1

From flashrom
Revision as of 04:58, 16 October 2020 by Dhendrix (talk | contribs)
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

This wiki is retired

Our website is https://www.flashrom.org, instructions on how to add or update documentation are here

All wiki content available in read-only mode at wiki.flashrom.org

JSPI1 is a 5x2 or 6x2 2.0mm pitch pin header on many MSI motherboards. It is used to recover from bad boot ROM images. Specifically, it appears to be used to connect an alternate ROM with a working image. Pull the #HOLD line low to deselect the onboard SPI ROM, allowing another SPI ROM to take its place on the bus. Pull the #WP line high to disable write-protection. Some boards use 1.8V flash chips, while others use 3.3V flash chips; Check the flash chip datasheet to determine the correct value.

JSPI1 (5x2)
name pin pin name
VCC 1 2 VCC
MISO 3 4 MOSI
#SS 5 6 SCLK
GND 7 8 GND
#HOLD 9 10 NC
JSPI1 (6x2)
name pin pin name
VCC 1 2 VCC
SO 3 4 SI
#SS 5 6 CLK
GND 7 8 GND
NC 9 10 NC (no pin)
#WP 11 12 #HOLD
name function
VCC Voltage (See up flash chip datasheet)
MISO SPI Master In/Slave Out
MOSI SPI Master Out/Slave In
#SS SPI Slave (Chip) Select (active low)
SCLK SPI Clock
GND ground/common
#HOLD SPI hold (active low)
#WP SPI write-protect (active low)
NC Not Connected (or no pin)