Peter Marheine has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/67825 )
Change subject: mediatek_i2c_spi: document programmer ......................................................................
mediatek_i2c_spi: document programmer
This adds a manpage section describing the mediatek_i2c_spi programmer, including some discussion of devices that are supported as well as which systems use them.
Signed-off-by: Peter Marheine pmarheine@chromium.org Change-Id: Ia63df470170fbadcabadcdad8e5acc0cde3a274b --- M flashrom.8.tmpl 1 file changed, 38 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/flashrom refs/changes/25/67825/1
diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl index 2cf3a38..45fb0e2 100644 --- a/flashrom.8.tmpl +++ b/flashrom.8.tmpl @@ -429,6 +429,8 @@ .sp .BR "* parade_lspcon" " (for SPI flash ROMs attached to Parade Technologies LSPCONs (PS175))" .sp +.BR "* mediatek_i2c_spi" " (for SPI flash ROMs attached to some Mediatek display devices accessible over I2C)" +.sp Some programmers have optional or mandatory parameters which are described in detail in the .B PROGRAMMER-SPECIFIC INFORMATION @@ -1521,7 +1523,7 @@ If the passed frequency is not supported by the adapter the nearest lower supported frequency will be used. .SS -.BR "realtek_mst_i2c_spi " and " parade_lspcon " programmers +.BR "realtek_mst_i2c_spi ", " parade_lspcon ", and " mediatek_i2c_spi " programmers .IP These programmers tunnel SPI commands through I2C-connected devices. The I2C bus over which communication occurs must be specified either by device path @@ -1575,6 +1577,27 @@ e.g. the PS175. Communication to the SPI flash is tunneled through the LSPCON over I2C.
+.SS +.BR "mediatek_i2c_spi " programmer +.IP +This programmer supports SPI flash programming for chips attached to some +Mediatek display controllers, themselves accessed through I2C (tunneling +SPI flash commands through a I2C connection with the host). +.sp +The programmer is designed to support the TSUMOP82JUQ integrated display driver +and scaler as is used in the Google Meet Series One Desk 27 (which runs a +version of ChromeOS and uses Flashrom in its \fBtsum-scaler-updater\fP scripts +that ship with the OS). Other chips may use compatible protocols but have not +been tested with this programmer, and external chip IOs may need to be +controlled through other non-Flashrom means to configure the chip in order for +it to operate as expected. +.sp +\fBdevpath\fP and \fBbus\fP options select the I2C bus to use, as described +previously. \fBallow_brick\fP defaults to no, and must explicitly be set to +"yes" in order for the programmer to operate. This is required because there is +no mechanism in the driver to positively identify that a given I2C bus is +actually connected to a supported device. + .SH EXAMPLES To back up and update your BIOS, run .sp
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Peter Marheine (Code Review)