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| author | Francis 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) |
| commit | 0751832f55922bc9a463997b121713dbed907b36 (patch) | |
| tree | 8f50e7e278cd4a4dc333ddcfd02b55458c273874 /docs/tasks.html | |
| parent | c3ed03fffee2327c2f80762a8b019989237e75aa (diff) | |
| download | libreboot-0751832f55922bc9a463997b121713dbed907b36.zip libreboot-0751832f55922bc9a463997b121713dbed907b36.tar.gz libreboot-0751832f55922bc9a463997b121713dbed907b36.tar.bz2 | |
docs/install/bbb_setup.html: Add info about wp/hold and pinouts
Diffstat (limited to 'docs/tasks.html')
| -rw-r--r-- | docs/tasks.html | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/docs/tasks.html b/docs/tasks.html index 5ce2bc9..f59a585 100644 --- a/docs/tasks.html +++ b/docs/tasks.html @@ -253,46 +253,6 @@ Get them for the following remaining boards: X60, T60, macbook21, R400 </li> <li> - Apparently, leaving HOLD and WP pins floating (unconnected) isn't a good idea. - Information online says that this needs to be connected along with 3.3V - look into this. - (it is specific to each flash chip, so read the datasheets). - <ul> - <li> - eg http://flashrom.org/FT2232SPI_Programmer - - " The WP# and HOLD# pins should be tied to VCC! If you leave them unconnected you'll likely experience strange issues." - </li> - <li> - <pehjota> stefanct: We've never had any "strange issues" with leaving WP# and HOLD# - unconnected on the Macronix and Atmel SOIC-8 and SOIC-16 flash chips on the X200. - IIRC, the datasheets don't say how those pins are wired internally or whether they can - be left unconnected. But I tested their voltages while flashing, and they float high - on their own, so they seem to support it fine. - </li> - <li> - <pehjota> fchmmr: You would connect the WP# and HOLD# pins to 3.3 V (on an ATX PSU you'd - hook up more cables to the other orange pins, with your PSU I guess you'd wrap more wires - around the 3.3-V screw), just like you do VCC. But as I said above, it doesn't seem to - be necessary (WP# and HOLD# seem to be held high already).<br/> - <pehjota> I got a solid ~3.3 V (i.e. pulled high, not floating between high and low) - from WP# and HOLD# with just VCC, GND, MOSI, MISO, CS#, and SCLK connected. Plus, we haven't - had any write protection issues as I'd expect from floating WP# and HOLD#, AFAIK.<br/> - <pehjota> fchmmr: These pins do nothing if they're held high. The "#" (not) means they cause different behavior when held low. - </li> - <li> - <stefanct> fchmmr: pehjota: it may not be a problem if the chip is soldered to the x200, but it surely is when it isnt. - </li> - <li> - <stefanct> yes... - <stefanct> a small note noting that would be appreciated because there are enough people out there already that ignore those pins and get stuck - >pehjota> stefanct: You mean a note in the libreboot documentation explaining why we don't have to connect HOLD# and WP# to anything and how they would have to be tied to VCC on a chip not soldered to a board? - <Kamilion> How about a more useful note that explains the whole discussion you two had succinctly? - <Kamilion> Not everyone is going to be an EE to know about the # indicating the pin should be pulled low to be active. - <Kamilion> reminds me, I need to pull out my pomona and try to fix some intel NIC roms - <stefanct> pehjota: yes - </li> - </ul> - </li> - <li> Adapt the notes at <a href="install/bbb_setup.html#stability">install/bbb_setup.html#stability</a> into a full guide. </li> |