Starting explaining flash D16

diff --git a/guider.mdwn b/guider.mdwn
index fb7c582c7a9b7edef22a2bdeccbaf728fefd75fd..1dcb352fa16caab96691da961d091a1949b6364b 100644 (file)
--- a/guider.mdwn
+++ b/guider.mdwn
@@ -63,7 +63,48 @@ For software config and settings see: [[https://github.com/Eliot-Roxbergh/dotFIl
 TODO improve GRUB config
 
 ####Flasha
-TODO 
+
+Flash chippet: Winbond W25Q16DV
+
+    1 CS          -> 17 SPIO_CSO  (red)
+    2 DO  (IO1)   -> 21 SPIO_DO   (black)
+    3 /WP (IO2)   -> 3.3V         (yellow)
+    4 GND         -> GND          (green)
+
+    8 VCC         -> 3.3V         (blue)
+    7 /HOLD (IO3) -> 3.3V         (orange)
+    6 CLK         -> 22 SPIO_SCLK (grey)
+    5 DI (IO0)    -> 18           (purple)
+
+
+    #change background (dest must be called background.png /jpg)
+    ./cbfstool yourrom.rom remove background.png -n background.png
+    ./cbfstool yourrom.rom add -f background.png -n background.png -t raw
+
+    #remember to backup current image if you'd like
+    #can read current contents a nr of times and they should be the same
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -r factory.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -r factory1.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -r factory2.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=1024 -r factory3.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=1024 -r factory4.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=1024 -r factory5.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=256 -r factory6.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=256 -r factory7.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=256 -r factory8.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=2048 -r factory9.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=2048 -r factory10.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=2048 -r factory11.rom
+    sha512sum factory*.rom #they should be the same..
+
+    #Flash ROM (can try different speeds)
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -w ~/libreboot_r20160907_grub_kgpe-d16/kgpe-d16_svenska_txtmode.rom
+
+    ## NOTE ##
+    # In my case (KGPE-D16) it is very difficult - seemingly at random - to achieve a configuration such as read and write has good reliability.
+    # Furthermore, writing has good success rate while reading is more error prone.
+    # Thus, it is possible to write to the ROM and read (e.g.) 10 times and compare the resulting `sha512sum` to that of the ROM downloaded from Libreboot.
+    # If the sum EXACTLY matches atleast once, it is reasonable to assume that the write indeed succeeded.
 
 ##Coreboot