From 583006cde166b0386c00f06385e3b74e1d40f873 Mon Sep 17 00:00:00 2001 From: Francis Rowe Date: Sun, 05 Apr 2015 20:07:38 -0400 Subject: docs/install/bbb_setup.html: notes about SPI flashing stability --- diff --git a/docs/install/bbb_setup.html b/docs/install/bbb_setup.html index 3997555..4e4b4a9 100644 --- a/docs/install/bbb_setup.html +++ b/docs/install/bbb_setup.html @@ -337,6 +337,49 @@ Note: flashrom can never write if the flash chip isn't found automatically.
+

Notes about stability

+ +

+ http://flashrom.org/ISP has some useful information about how + to make flashing more reliable. Currently, we use spispeed=512 but it is possible to make some + mods so that higher speeds can be used without any instability. +

+ +

+ tty0_ in the coreboot IRC channel had this to say: +

+
+<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
+
+ +
+ +
+

EHCI debugging

diff --git a/docs/release.html b/docs/release.html index a33fe78..0719a78 100644 --- a/docs/release.html +++ b/docs/release.html @@ -460,6 +460,10 @@

  • + Adapt the notes at install/bbb_setup.html#stability + into a full guide. +
  • +
  • Add guides for GM45 laptops in docs/security/
  • -- cgit v0.9.1