From ff064cd650e7690dd393c9fb0a56dd3e473eada4 Mon Sep 17 00:00:00 2001 From: Francis Rowe Date: Tue, 12 May 2015 00:20:20 +0100 Subject: docs/install/bbb_setup.html: improve notes about stability --- docs/install/bbb_setup.html | 50 +++++++++++++++------------------------------ 1 file changed, 17 insertions(+), 33 deletions(-) (limited to 'docs/install') diff --git a/docs/install/bbb_setup.html b/docs/install/bbb_setup.html index 5579132a..933a6142 100644 --- a/docs/install/bbb_setup.html +++ b/docs/install/bbb_setup.html @@ -372,40 +372,24 @@ GND 4-5 MOSI

- tty0_ in the coreboot IRC channel had this to say: + http://flashrom.org/ISP + is what we typically do in libreboot, though not always. That page + has some notes about using resistors to affect stability.

-
-<stefanct> http://flashrom.org/ISP
-<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
-<tty0_> yep
-<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_> BBB
-
-<tty0_> http://i.imgur.com/qHGxKpj.jpg
-<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: +

+ -- cgit v1.2.3-70-g09d2