diff --git a/user-doc/user-doc.tex b/user-doc/user-doc.tex index 4a6e224..7cb920b 100644 --- a/user-doc/user-doc.tex +++ b/user-doc/user-doc.tex @@ -227,7 +227,7 @@ flashrom v0.9.4 : bc6cab1 : Oct 30 2014 07:32:01 UTC on Linux 4.9.4-gentoo (x86 vendor="Macronix" name="MX25L6406E" ./flashrom --programmer=buspirate_spi:dev=/dev/buspirate --get-size flashrom v0.9.4 : bc6cab1 : Oct 30 2014 07:32:01 UTC on Linux 4.9.4-gentoo (x86_64), built with libpci 3.1.10, GCC 4.8.x-google 20140307 (prerelease), little endian -8388608 +16777216 \end{minted} Further, Google's fork of flashrom allows us to tag regions on the SPI NOR flash chip with a custom name. @@ -254,28 +254,36 @@ Now that the images have been written to their respective regions, we can look a flashrom v0.9.4 : bc6cab1 : Oct 30 2014 07:32:01 UTC on Linux 4.9.4-gentoo (x86_64), built with libpci 3.1.10, GCC 4.8.x-google 20140307 (prerelease), little endian Valid write protection ranges: start: 0x000000, length: 0x000000 -start: 0x7e0000, length: 0x020000 -start: 0x7c0000, length: 0x040000 -start: 0x7a0000, length: 0x080000 -start: 0x700000, length: 0x100000 -start: 0x600000, length: 0x200000 -start: 0x400000, length: 0x400000 -start: 0x000000, length: 0x800000 -start: 0x000000, length: 0x800000 +start: 0xfc0000, length: 0x040000 +start: 0xf80000, length: 0x080000 +start: 0xf00000, length: 0x100000 +start: 0xe00000, length: 0x200000 +start: 0xc00000, length: 0x400000 +start: 0x800000, length: 0x800000 +start: 0x000000, length: 0x040000 +start: 0x000000, length: 0x080000 +start: 0x000000, length: 0x100000 +start: 0x000000, length: 0x200000 start: 0x000000, length: 0x400000 -start: 0x000000, length: 0x600000 -start: 0x000000, length: 0x700000 -start: 0x000000, length: 0x780000 -start: 0x000000, length: 0x7c0000 -start: 0x000000, length: 0x7e0000 start: 0x000000, length: 0x800000 +start: 0x000000, length: 0x1000000 +start: 0xfff000, length: 0x001000 +start: 0xffe000, length: 0x002000 +start: 0xffc000, length: 0x004000 +start: 0xff8000, length: 0x008000 +start: 0xff8000, length: 0x008000 +start: 0x000000, length: 0x001000 +start: 0x000000, length: 0x002000 +start: 0x000000, length: 0x004000 +start: 0x000000, length: 0x008000 +start: 0x000000, length: 0x008000 \end{minted} Since we don't want our images to be tampered with, we want to enable write-protection for the full range. We can configure the write-protected range as follows: \begin{minted}[breaklines]{text} -./flashrom --programmer=buspirate_spi:spispeed=2M,dev=/dev/buspirate --wp-range 0x000000 0x800000 +./flashrom --programmer=buspirate_spi:spispeed=2M,dev=/dev/buspirate --wp-range 0x000000 0x1000000 \end{minted} After setting the range, we are still able to modify the contents of the entire SPI NOR flash chip.