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| author | Francis Rowe <info@gluglug.org.uk> | 2015-04-06 01:07:38 +0100 |
|---|---|---|
| committer | Francis Rowe <info@gluglug.org.uk> | 2015-04-06 01:07:38 +0100 |
| commit | 583006cde166b0386c00f06385e3b74e1d40f873 (patch) | |
| tree | 6b39b0818b97269341e102190cdecedb54465deb /docs/install | |
| parent | 9f0a7c4f5d656e8ff6c18d7c928085a579a831d8 (diff) | |
| download | librebootfr-583006cde166b0386c00f06385e3b74e1d40f873.tar.gz librebootfr-583006cde166b0386c00f06385e3b74e1d40f873.zip | |
docs/install/bbb_setup.html: notes about SPI flashing stability
Diffstat (limited to 'docs/install')
| -rw-r--r-- | docs/install/bbb_setup.html | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/docs/install/bbb_setup.html b/docs/install/bbb_setup.html index 39975556..4e4b4a91 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. <div class="section"> + <h1 id="stability">Notes about stability</h1> + + <p> + <a href="http://flashrom.org/ISP">http://flashrom.org/ISP</a> 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. + </p> + + <p> + <b>tty0_</b> in the coreboot IRC channel had this to say: + </p> +<pre> +<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 +</pre> + + </div> + + <div class="section"> + <h1>EHCI debugging</h1> <p> |