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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 26 |
1 files changed, 13 insertions, 13 deletions
@@ -25,16 +25,17 @@ board, rev02, implementing tamper detection and master key erasure. The MKM holds the master key for the device. -The AVR, MKM and the mux are battery powered. +The AVR, MKM and the mux are all battery powered. -The AVR and the FPGA are sharing access to the MKM through the mux, -with the AVR connected to the pins used for deciding who's in control -of the memory. The FPGA is in control by default. +The AVR and the FPGA are both sharing access to the MKM through the +mux, with the AVR connected to the pins used for deciding who's in +control of the memory. If the AVR doesn't actively grab control of the +MKM, the FPGA is in control. -When the panic button is pressed, the AVR grabs the MKM and writes -zeros to it as quickly as possible. In idle mode, i.e. when the panic -button is not pressed, the AVR tries to consume as little power as -possible. +When the panic button is pressed, the AVR takes control over the MKM +and writes zeros to it as quickly as possible. In idle mode, i.e. when +the panic button is not pressed, the AVR tries to consume as little +power as possible. ## Building the software @@ -58,10 +59,10 @@ this directory could be appended to avrdude.conf: cat attiny828.conf >> /etc/avrdude.conf -Often, a piece of hardware often called an SPI programmer is needed in -order to upload the .hex file. The one I've been using has -"sparkfun.com" printed on it. This small board has a mini-USB port to -connect to a host system and a header with SPI pins to connect to a +Often, a piece of hardware called "SPI programmer" is needed in order +to upload the .hex file to the target system. The one I've been using +has "sparkfun.com" printed on it. This small board has a mini-USB port +to connect to a host system and a header with SPI pins to connect to a board with an AVR on it. To upload a .hex file to a board, use the upload.sh shell script in @@ -71,4 +72,3 @@ this directory with the name of the file as the only argument: Depending on permissions on your host system you might want to run the upload script as root. - |