From: Bryan Whitehead <bryan.whiteh...@microchip.com> Date: Wed, 23 Jan 2019 15:18:47 -0500
> The LAN743x includes on chip One-Time-Programmable (OTP) memory. > > This patch extends the ethtool EEPROM read/write interface to > access OTP memory space. > > The currently existing interface is limited, as it does not > allow OTP read, and OTP writes are restricted to > offset==0, length==512, and data[0]==0xF3. > > This patch removes these restrictions and adds a private flag > called OTP_ACCESS, which is used to switch between EEPROM, and > OTP modes. > > The private flag OTP_ACCESS is configurable through the > ethtool --set-priv-flags command. > And visible through the > ethtool --show-priv-flags command. > > By default OTP_ACCESS is false, and there for previously existing > EEPROM commands will work exactly the same. However now access to > OTP requires one extra step of setting OTP_ACCESS to true. This > flag controls the read, write, and length reporting, functions > of ethtool. > > EEPROM presence is not checked when setting or clearing this flag. > If the EEPROM is not present, the user, as before, will need to > diagnose that using existing read and write function of ethtool, > while OTP_ACCESS is false. > > Updates for V2: > Added comments as to why this patch is needed. > Added comments explaining that EEPROM presence is not check > when setting or clearing the OTP_ACCESS flag. > Added length checking to all otp/eeprom read/write functions. > > Signed-off-by: Bryan Whitehead <bryan.whiteh...@microchip.com> Applied, thanks.
