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authorFrancis Rowe <info@gluglug.org.uk>2015-05-11 07:59:18 (EDT)
committer Francis Rowe <info@gluglug.org.uk>2015-05-11 07:59:18 (EDT)
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parentc3ed03fffee2327c2f80762a8b019989237e75aa (diff)
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docs/install/bbb_setup.html: Add info about wp/hold and pinouts
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@@ -297,6 +297,21 @@ Note: flashrom can never write if the flash chip isn't found automatically.
18 - - 3.3V PSU RED
22 - - NC - this is pin 1 on the flash chip
<i>This is how you will connect. Numbers refer to pin numbers on the BBB, on the plugs near the DC jack.</i>
+
+You may also need to connect pins 1 and 9 (tie to 3.3V supply). These are HOLD# and WP#.
+On some systems they are held high, if the flash chip is attached to the board.
+If you're flashing a chip that isn't connected to a board, you'll almost certainly
+have to connect them.
+
+SOIC16 pinout (more info available online, or in the datasheet for your flash chip):
+HOLD 1-16 SCK
+VDD 2-15 MOSI
+N/C 3-14 N/C
+N/C 4-13 N/C
+N/C 5-12 N/C
+N/C 6-11 N/C
+SS 7-10 GND
+MISO 8-9 WP
</pre>
<p>
The following shows how to connect clip to the BBB (on the P9 header), for SOIC-8 (clip: Pomona 5250):
@@ -307,6 +322,17 @@ Note: flashrom can never write if the flash chip isn't found automatically.
NC - - 21
3.3V PSU RED - - 17 - this is pin 1 on the flash chip
<i>This is how you will connect. Numbers refer to pin numbers on the BBB, on the plugs near the DC jack.</i>
+
+You may also need to connect pins 3 and 7 (tie to 3.3V supply). These are HOLD# and WP#.
+On some systems they are held high, if the flash chip is attached to the board.
+If you're flashing a chip that isn't connected to a board, you'll almost certainly
+have to connect them.
+
+SOIC8 pinout (more info available online, or in the datasheet for your flash chip):
+SS 1-8 VDD
+MISO 2-7 HOLD
+WP 3-6 SCK
+GND 4-5 MOSI
</pre>
<p>
<b>NC = no connection</b>