Author: Francis Rowe <email@example.com>
Date: Tue, 12 May 2015 00:20:20 +0100
docs/install/bbb_setup.html: improve notes about stability
2 files changed, 17 insertions(+), 37 deletions(-)
diff --git a/docs/install/bbb_setup.html b/docs/install/bbb_setup.html
@@ -372,40 +372,24 @@ GND 4-5 MOSI
- <b>tty0_</b> in the coreboot IRC channel had this to say:
+ <a href="http://flashrom.org/ISP">http://flashrom.org/ISP</a>
+ is what we typically do in libreboot, though not always. That page
+ has some notes about using resistors to affect stability.
-<stefanct> i was even using 220 ohm today
-<tty0_> fchmmr: I flash with 20MHz. But had to do a lot of stuff to make it work:
-<n1cky> stefanct: got a picture?
-<tty0_> I made "coax" with 0.1 mm core and aluminum foley (from my kitchen), add 100 Ohm resistors (serial)
-<tty0_> above the aluminum foley i've put heatshrink
-<stefanct> i think that's a bit overkill :)
-<tty0_> did this for: CS, CLK, D0, D1
-<tty0_> i can flash with 50MHz
-* roxfan has quit (Ping timeout: 246 seconds)
-<tty0_> I planned to take pics and explain
-<fchmmr> sgsit, 50MHz / 0.5MHz = 100 times faster than what we are used to.
-<kmalkki> and flashrom does not tell you the correct actual SPI clock
-<kmalkki> (for spidev on BBB)
-<fchmmr> tty0_, I'm adding these notes to the libreboot documentation.
-<tty0_> 512 takes forever (compared with this)
-<fchmmr> tty0_, more notes from you (and photos), probably a full guide, would be very useful for a lot of people.
-<tty0_> kmalkki: yes
-<stefanct< and on the bbb the maximum is in the device tree
-<tty0_> stefanct: If you have to do it many times it it worth i believe. I had so much problems flashing my x200t without it
-<stefanct< in my case it is 16MHz
-<stefanct< tty0_: if it helps... sure
-<kmalkki> tty0_: so what hardware did you claim 50MHz with?
-<tty0_> BTW, i use twisted pair as core (in case i need to put capacitors)
-<tty0_> One of my early x200t attempts: http://i.imgur.com/L0fVK3i.jpg
+ tty0_ in #libreboot was able to get better flashing speeds with the following configuration:
+ <li>"coax" with 0.1 mm core and aluminum foley (from my kitchen), add 100 Ohm resistors (serial)</li>
+ <li>put heatstrink above the foley, for: CS, CLK, D0, D1</li>
+ <li>Twisted pair used as core (in case more capacitors are needed)</li>
+ See this image:
+ <a href="http://i.imgur.com/qHGxKpj.jpg">http://i.imgur.com/qHGxKpj.jpg</a>
+ <li>He was able to flash at 50MHz (lower speeds are also fine).</li>
diff --git a/docs/tasks.html b/docs/tasks.html
@@ -240,10 +240,6 @@
Get them for the following remaining boards: X60, T60, macbook21, R400
- Adapt the notes at <a href="install/bbb_setup.html#stability">install/bbb_setup.html#stability</a>
- into a full guide.
There are no instructions for how to use the GRUB terminal to find
a grub.cfg manually, or how to boot an installed GNU/Linux manually,
so some users get stuck after the initial installation of libreboot