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| author | Leah Rowe <info@minifree.org> | 2016-09-03 18:06:48 +0100 |
|---|---|---|
| committer | Leah Rowe <info@minifree.org> | 2016-09-03 18:06:48 +0100 |
| commit | b9e8c1020a47a183fd9a533f7230197fbb86f472 (patch) | |
| tree | 29353762c49c0b72b7714eff692af4906a6b80b3 /docs/install/bbb_ehci.html | |
| parent | 6a7d71cd4ce6abaa99ff26a1b0f38eecd8f07c83 (diff) | |
| download | librebootfr-b9e8c1020a47a183fd9a533f7230197fbb86f472.tar.gz librebootfr-b9e8c1020a47a183fd9a533f7230197fbb86f472.zip | |
docs/install/bbb_ehci.html moved to docs/misc/
Diffstat (limited to 'docs/install/bbb_ehci.html')
| -rw-r--r-- | docs/install/bbb_ehci.html | 514 |
1 files changed, 0 insertions, 514 deletions
diff --git a/docs/install/bbb_ehci.html b/docs/install/bbb_ehci.html deleted file mode 100644 index 3cdda48a..00000000 --- a/docs/install/bbb_ehci.html +++ /dev/null @@ -1,514 +0,0 @@ -<!DOCTYPE html> -<html> -<head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1"> - - <style type="text/css"> - @import url('../css/main.css'); - </style> - - <title>EHCI debugging on the BeagleBone Black</title> -</head> - -<body> - - <div class="section"> - <h1 id="pagetop">EHCI debugging on the BeagleBone Black</h1> - - <p><a href="index.html">Back to previous index</a></p> - </div> - - <div class="section"> - <h1>EHCI debugging</h1> - <ol class="toc"> - <li><a href="#FindUSBportonthetargetthatsupportsEHCIdebug">Find - USB port on the target that supports EHCI debug</a></li> - <li><a href="#InitialsetupofBBBtoactasEHCIdebugdongle">Initial - setup of BBB to act as EHCI debug dongle</a></li> - <li><a href="#PatchBBBsgdbgpmoduleoptionalbuthighlyrecommended">Patch - BBB's <tt>g_dbgp</tt> module (optional, but highly recommended)</a></li> - <li><a href="#ConfigurelibrebootwithEHCIdebug">Configure - libreboot with EHCI debug</a> - <ol> - <li><a href="#SelectingHCDIndexandUSBDebugport">Selecting - <tt>HCD Index</tt> and <tt>USB Debug port</tt></a></li> - </ol></li> - <li><a href="#Howtogetthedebuglogs">How to get the debug - logs</a></li> - <li><a - href="#EnebleEHCIDebugonthetargetskerneloptionalrecommended">Eneble - EHCI Debug on the target's kernel (optional, recommended)</a></li> - <li><a href="#References">References</a></li> - </ol> - <p>If your computer does not boot after installing libreboot, it is - very useful to get debug logs from it, from the payload (grub) and/or - the kernel (if gets to there). All of them stream debug logs on the - available serial (RS-232) by default. However, most of todays laptops - lack RS-232 port. The other option is to stream the logs to USB EHCI - debug port.</p> - <p>This section explains step-by-step how to setup BBB as a - “USB EHCI debug dongle” and configure libreboot and the - linux kernel to stream logs to it (TODO: grub).</p> - <p>I will refer to three computers:</p> - <ul> - <li><b>host</b> - this is the computer you use, have - tools, compiler, Internet, etc</li> - <li><b>BBB</b> - Beaglebone Black (rev. B or higher, i - use rev. C)</li> - <li><b>target</b> - the computer you are trying to - install liberboot</li> - </ul> - <h3 id="FindUSBportonthetargetthatsupportsEHCIdebug">Find USB port - on the target that supports EHCI debug</h3> - <p> - Not all USB controllers support EHCI debug (see: <a - href="http://www.coreboot.org/EHCI_Debug_Port#Hardware_capability">EHCI - Debug Port</a> ). Even more, if a USB controller supports EHCI debug, it - is available only <b>on a single port</b> that might or might - not be exposed externally. - </p> - <ul> - <li>You need running OS (GNU/Linux) on your target for this step - (If you’ve flashed libreboot and it does not boot, you have to - flush back the stock bios)</li> - <li>You need USB memory stick (the data on it will not be - touched).</li> - <li>The EHCI debugging can not be done through external hub, BBB - must be connected directly to the debug port of the controller (so, no - hubs)</li> - </ul> - <ul> - <li>Download<sup class="footnote"><a href="#___fn1">1</a></sup> <a - href="http://www.coreboot.org/pipermail/coreboot/attachments/20080909/ae11c291/attachment.sh">this</a> - shell script. - </li> - </ul> - <ol> - <li>Plug the usb stick in the first available usb port</li> - <li>Run the script, you will get output similar to following:</li> -<pre>The following PCI devices support a USB debug port (says lspci): 0000:00:1a.0 0000:00:1d.0 -The following PCI devices support a USB debug port (says the kernel): 0000:00:1a.0 0000:00:1d.0 -*PCI device 0000:00:1a.0, USB bus 3, USB physical port 1* -*PCI device 0000:00:1d.0, USB bus 4, USB physical port 2* -Currently connected high-speed devices: -/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M - |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M - |__ Port 7: Dev 14, If 0, Class=Hub, Driver=hub/4p, 480M - |__ Port 1: Dev 15, If 0, Class=Hub, Driver=hub/4p, 480M - |__ Port 3: Dev 17, If 0, Class=Hub, Driver=hub/2p, 480M - |__ Port 4: Dev 18, If 0, Class=Hub, Driver=hub/4p, 480M -/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M - |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M -/: *Bus 01*.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M - |__ *Port 3: Dev 31, If 0, Class=Mass Storage, Driver=usb-storage, 480M* -</pre> - <li>The buses the support debug are Bus 3 (0000:00:1a.0) on Port 1 - and Bus 4 (0000:00:1d.0) on port 2. Your usb stick is plugged on Bus - 1, Port 3</li> - <li>Repeat the steps, plugging the USB stick in the next available - port</li> - <li>Go through all available ports and remember(write down) those - for which bus/port of the usb stick matches one of the bus/port that - support debug (bold).</li> - </ol> - <p>Remember (write down) for each port (external plug) you found - that supports debug: <b>PCI device id, the bus id, the port number, and - the physical location of the usb plug.</b></p> - <p>If you do not find a match, you can not get debug over EHCI. - Sorry.</p> - <p id="___fn1" class="footnote"> - <sup>1</sup> The guys from coreboot were talking about including the - script in coreboot distribution (check the status). - </p> - <h3 id="InitialsetupofBBBtoactasEHCIdebugdongle">Initial setup of - BBB to act as EHCI debug dongle</h3> - <p>BBB must be powered with a barrel power connector since the - mini-B USB plug will be used for the EHCI debug stream. So you will - need:</p> - <ul> - <li>power supply (5V, 2A(10W) is sufficient).</li> - <li>an extra usb cable: A to mini-B</li> - </ul> - <p> - (On BBB) The linux kernel includes module (g_dbgp that enables one of the usb ports on a computer to behave as EHCI - debug dongle. Make sure you have this module available on your BBB - (Debian 7.8 that comes with BBB should have it), if not, you should - compile it yourself (see next section): - </p> -<pre>ls /lib/modules/3.8.13-bone70/kernel/drivers/usb/gadget/g_dbgp.ko</pre> - <p> - Unload all other - g_* - modules: - </p> -<pre># lsmod -# rmmod g_multi -... -</pre> - <p> - Then load - g_dbgp - : - </p> -<pre># modprobe g_dbgp -# lsmod # should show that g_dbgp is loaded, and no other g_* -</pre> - <p> - Plug the mini-B side of the USB cable in your BBB and the A side in - your target. Then one of the usb devices on your target (with - lsusb - ) should be: - </p> -<pre>Bus 001 Device 024: ID 0525:c0de Netchip Technology, Inc.</pre> - <p>If you see the device on the target, you are good to continue to - the next step.</p> - <h3 id="PatchBBBsgdbgpmoduleoptionalbuthighlyrecommended"> - Patch BBB’s - g_dbgp - module (optional, but highly recommended) - </h3> - <p> - For the reasons why you need this, see: <a - href="http://www.coreboot.org/EHCI_Gadget_Debug">EHCI Gadget Debug</a>.<br />Make - sure that you have cross compiling environment for - arm-linux-gnueabihf - setup on your <em>host</em>. - </p> - <ul> - <li>On BBB: uname -r - this will give you version - number like 3.8.13-bone70 (I will refer to this as: $mav.$miv-$lv: - where mav=3.8, miv=13, lv=bone70 - </li> - <li>Get the BBB kernel ready on your host for cross-compiling:</li> - </ul> -<pre>$ cd $work_dir -$ git clone https://github.com/beagleboard/kernel.git -$ cd kernel -$ git checkout $mav (see above) -$ ./patch.sh -$ wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O kernel/firmware/am335x-pm-firmware.bin -$ cp configs/beaglebone kernel/arch/arm/configs/beaglebone_defconfig -</pre> - <ul> - <li>Download the patch from <a - href="http://www.coreboot.org/images/8/88/Ehci-debug-gadget-patches.tar.gz">here</a></li> - <li>tar -xf Ehci-debug-gadget-patches.tar.gz (will - create dir: usbdebug-gadget)</li> - <li>Note that there are two patches (patch_1 and patch_2) for each - of the two different version of the kernel (3.8 and 3.10). I will use - 3.8. (If using kernel 3.12 patch_1 is not needed)</li> - <li>cd kernel (note that this is one more level: you - should be in $work_dir/kernel/kernel)</li> - <li>Apply the patches:</li> - </ul> -<pre> -git apply ../usbdebug-gadget/v3.8-debug-gadget/0001-usb-dbgp-gadget-Fix-re-connecting-after-USB-disconne.patch -git apply ../usbdebug-gadget/v3.8-debug-gadget/0002-usb-serial-gadget-no-TTY-hangup-on-USB-disconnect-WI.patch -; -make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- beaglebone_defconfig -j4@ -</pre> - <ul> - <li> - You should also apply the linux-libre <i>deblob</i> script to turn it into linux-libre - (deletes all the blobs from the linux kernel). - <a href="http://www.fsfla.org/ikiwiki/selibre/linux-libre/">fsfla website</a> - - see <a href="http://www.fsfla.org/svn/fsfla/software/linux-libre/scripts/">scripts</a>. - </li> - <li>Get your current BBB kernel config (from: /boot/config-<ver>) - and copy it to your host as $work_dir/kernel/kernel/.config</li> -<pre> -make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- oldconfig - all default answers</pre> - <li>Set proper version number: - <ul> - <li>On your host, edit $work_dir/kernel/kernel/.config - (the one you’ve just copied from BBB), find the line CONFIG_LOCALVERSION="<something - or empty>" and change it to CONFIG_LOCALVERSION="-$lv", - so it will look something like: CONFIG_LOCALVERSION="-bone70"</li> - </ul> - </li> - <li>Also, make sure that: CONFIG_USB_G_DBGP=m (If - not, make menuconfig, and set @Device Drivers-> USB - Support -> USB Gadget Support -> EHCI Debug Device Gadget=m</li> - <li>Build the module:</li> - </ul> -<pre> -$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j4 (is it possoble to build only the gadget modules) -$ mkdir ../tmp && make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=../tmp modules_install -</pre> - <ul> - <li>on BBB, backup /lib/modules/3.8.13-bone70/kernel/drivers/usb/gadget - (i.e. mv - /lib/modules/3.8.13-bone70/kernel/drivers/usb/gadget $HOME) - </li> - <li>copy the freshly compiled usb/gadget dir to /lib/modules/3.8.13-bone70/kernel/drivers/usb</li> - <li>restart BBB</li> - <li>Remove all g_* modules (rmmod - g_<>) - </li> - <li>modprobpe g_dbgp</li> - </ul> - <h3 id="ConfigurelibrebootwithEHCIdebug">Configure libreboot with - EHCI debug</h3> - <p> - Libreboot(coreboot) should be configured with debug turned on and to - push debug messages to the EHCI debug port.<br />If you’ve - downloaded the binary distribution, you can check if it is properly - configured in the following way: - </p> - <ul> - <li>Go to the libreboot dist root directory cd - $libreboot_bin</li> - <li>Locate the rom image for your target (I will call it: $img_path) - </li> - <li>Running the following command will extract the config in a - file ./my_config: - </li> - </ul> -<pre> -./cbfstool/i686/cbfstool $img_path extract -n config -f ./my_config -</pre> - <ul> - <li>Make sure that the following params in the config are set as - following:</li> - </ul> -<pre> -CONFIG_USBDEBUG=y (Generic Drivers -> USB 2.0 EHCI debug dongle support) -CONFIG_USBDEBUG_IN_ROMSTAGE=y (Generic Drivers -> Enable early (pre-RAM) usbdebug) -CONFIG_USBDEBUG_HCD_INDEX=<HCD Index of usb controller - see below> (Generic Drivers -> Index for EHCI controller to use with usbdebug) -CONFIG_USBDEBUG_DEFAULT_PORT=<USB Debug port - see below> (Generic Drivers -> Default USB port to use as Debug Port) -</pre> - <p> - The following three are behind radio button in the menu. Only the first - one<sup class="footnote"><a href="#___fn2">2</a></sup> should be = y - </p> -<pre> -USBDEBUG_DONGLE_STD=y (Generic Drivers -> Type of dongle (Net20DC or compatible) -> Net20DC or compatible) -CONFIG_USBDEBUG_DONGLE_BEAGLEBONE=n (Generic Drivers -> Type of dongle (Net20DC or compatible) -> BeagleBone) -CONFIG_USBDEBUG_DONGLE_BEAGLEBONE_BLACK=n (Generic Drivers -> Type of dongle (Net20DC or compatible) -> BeagleBone Black) -</pre> - <p id="___fn2" class="footnote"> - <sup>2</sup> The g_dbgp module on BeagleBone Black (Rev. C) reports it self as Net20DC, the - other options are for older BB(B) - ver1. This is documented <a - href="https://johnlewis.ie/coreboot-ehci-debug-gadget-demonstration/">here</a> - (also tested/verified). - </p> - <p> - Then:<br /> -<pre> -CONFIG_CONSOLE_USB=y (Console -> USB dongle console output) -</pre> - </p> - <p> - Also - Debugging ---> Output verbose XYZ - ) (<b>FIXME</b> somebody verify these): - </p> -<pre> -CONFIG_DEBUG_CBFS=y (Output verbose CBFS debug messages ) -CONFIG_HAVE_DEBUG_RAM_SETUP=y (??? What/where is this) -CONFIG_DEBUG_RAM_SETUP=y (Output verbose RAM init debug messages) -CONFIG_DEBUG_SMI=y (Output verbose SMI debug messages) -CONFIG_DEBUG_ACPI=y (Output verbose ACPI debug messages ) -CONFIG_DEBUG_USBDEBUG=y (Output verbose USB 2.0 EHCI debug dongle messages) -</pre> - <p>If some of the above mentioned configuration options are not as - specified, you have to configure and compile libreboot yourself. Please - refer to the doc(<b>FIXME: link</b> about compiling libreboot.</p> - <h4 id="SelectingHCDIndexandUSBDebugport"> - Selecting - HCD Index - and - USB Debug port - </h4> - <p> - This applies (and works) only if the USB controller that supports debug - (found in the first section) is from Intel.<br />If the PCI ID of the - port you found in the first section is - 0000:00:1a.0 - or - 0000:00:1d.0 - , you are ok. Otherwise you have to try without guarantee that will - work. - </p> - <p> - If the externally exposed port is on a bus with - PCI ID == 0000:00:1a.0 - then for - CONFIG_USBDEBUG_HCD_INDEX - choose 2, otherwise choose 0 - . - </p> - <p> - For - CONFIG_USBDEBUG_DEFAULT_PORT - choose the port from the first section that correspond to the - PCI ID - </p> - <p> - Notes:<br />The above is based on the implementation of - coreboot/src/southbridge/intel/common/usb_debug.c : pci_ehci_dbg_dev() - .<br />This is enough as it applies for the supported GM45/G45 - Thinkpads. coreboot support some other contollers too, but they are - irellevent for libreboot (for now). - </p> - <ul> - <li>On T500 (with switchable GPU) the debug ports for both intel - controllers is exposed.</li> - <li>On x200t the debug ports for both intel controllers is - exposed.</li> - </ul> - <h3 id="Howtogetthedebuglogs">How to get the debug logs</h3> - <ul> - <li>Plug the USB cable in the target’s debug port (the one - you found in step 1) and BBB’s mini-B USB</li> - <li>Make sure no other then g_dbgp of the g_* - modules is loaded on your BBB - </li> - <li>On the BBB:</li> - </ul> -<pre> -stty -icrnl -inlcr -F /dev/ttyGS0 -cat /dev/ttyGS0 -</pre> - <ul> - <li>Power on the target with libreboot</li> - <li>You should see debug logs comming on your BBB console</li> - </ul> - <p> - Note that this is not permanent on BBB, if you reboot it, you have to - rmmod g_* - and - modprobe g_dbgp - </p> - <h3 id="EnebleEHCIDebugonthetargetskerneloptionalrecommended">Eneble - EHCI Debug on the target’s kernel (optional, recommended)</h3> - <p>You have to know how to compile kernel for your target.</p> - <ol> - <li>Check if early debugging is already enabled: grep - CONFIG_EARLY_PRINTK_DBGP /boot/config-<ver></li> - <li>If enabled, you do not have to compile the kernel (skip this - step). Otherwise, prepare kernel source for your distribution and - select (Kernel hacking -> Early printk via EHCI debug - port). Compile and install the new kernel. - </li> - <li>Edit your grub configuration and add following to the kenel - parameters<sup class="footnote"><a href="#___fn20">20</a></sup><sup - class="footnote"><a href="#___fn21">21</a></sup>: earlyprintk=dbgp,keep. - Also, try: earlyprintk=dbgp<N>,keep where N - is the debug port id if the first does not work. - </li> - </ol> - <h3 id="References">References</h3> - <p id="___fn10" class="footnote"> - <sup>10</sup> <a href="http://www.coreboot.org/EHCI_Debug_Port">EHCI - Debug Port</a> - </p> - <p id="___fn11" class="footnote"> - <sup>11</sup> <a - href="https://johnlewis.ie/coreboot-ehci-debug-gadget-demonstration/">coreboot - EHCI debug gadget demonstration</a> - </p> - <p id="___fn12" class="footnote"> - <sup>12</sup> <a href="http://www.coreboot.org/EHCI_Gadget_Debug">EHCI - Gadget Debug</a> - </p> - <p id="___fn13" class="footnote"> - <sup>13</sup> <a - href="http://www.coreboot.org/images/8/88/Ehci-debug-gadget-patches.tar.gz">Ehci-debug-gadget-patches.tar.gz</a> - </p> - <p id="___fn14" class="footnote"> - <sup>14</sup> <a - href="http://wiki.beyondlogic.org/index.php/BeagleBoneBlack_Building_Kernel">Compiling - the BeagleBone Black Kernel</a> - </p> - <p id="___fn15" class="footnote"> - <sup>15</sup> - http://dumb-looks-free.blogspot.ca/2014/06/beaglebone-black-bbb-compile-kernel.html - </p> - <p id="___fn16" class="footnote"> - <sup>16</sup> - http://dumb-looks-free.blogspot.fr/2014/06/beaglebone-black-bbb-kernal-headers.html - </p> - <p id="___fn17" class="footnote"> - <sup>17</sup> <a href="http://elinux.org/Building_BBB_Kernel">Building - BBB Kernel</a> - </p> - <p id="___fn18" class="footnote"> - <sup>18</sup> - http://komposter.com.ua/documents/USB-2.0-Debug-Port%28John-Keys%29.pdf - </p> - <p id="___fn19" class="footnote"> - <sup>19</sup> <a href="http://cs.usfca.edu/~cruse/cs698s10/">Exploring - USB at the Hardware/Software Interface</a> - </p> - <p id="___fn20" class="footnote"> - <sup>20</sup> - https://www.kernel.org/doc/Documentation/x86/earlyprintk.txt - </p> - <p id="___fn21" class="footnote"> - <sup>21</sup> https://wiki.ubuntu.com/Kernel/Debugging/USBearlyprintk - </p> - <p> - <b>TODO</b>: - </p> - <ol> - <li>grub does not send messages to EHCI debug. Investigate.</li> - <li>The section “Configure libreboot with EHCI debug” - can be skipped/simplified if a common configuration works for all - relevant targets is selected as defualt</li> - <li>Patch and compule g_dbgp on BBB instead cross-compile</li> - <li>Find a simple way to send debug messages from targets userland</li> - </ol> - </div> - - <div class="section"> - - <p> - Copyright © 2015 Alex David <opdecirkel@gmail.com><br/> - Permission is granted to copy, distribute and/or modify this document - under the terms of the GNU Free Documentation License, Version 1.3 - or any later version published by the Free Software Foundation; - with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. - A copy of the license can be found at <a href="../gfdl-1.3.txt">../gfdl-1.3.txt</a> - </p> - - <p> - Updated versions of the license (when available) can be found at - <a href="https://www.gnu.org/licenses/licenses.html">https://www.gnu.org/licenses/licenses.html</a> - </p> - - <p> - UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE - EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS - AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF - ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, - IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, - WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR - PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, - ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT - KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT - ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU. - </p> - <p> - TO THE EXTENT POSSIBLE, IN NO EVENT WILL THE LICENSOR BE LIABLE - TO YOU ON ANY LEGAL THEORY (INCLUDING, WITHOUT LIMITATION, - NEGLIGENCE) OR OTHERWISE FOR ANY DIRECT, SPECIAL, INDIRECT, - INCIDENTAL, CONSEQUENTIAL, PUNITIVE, EXEMPLARY, OR OTHER LOSSES, - COSTS, EXPENSES, OR DAMAGES ARISING OUT OF THIS PUBLIC LICENSE OR - USE OF THE LICENSED MATERIAL, EVEN IF THE LICENSOR HAS BEEN - ADVISED OF THE POSSIBILITY OF SUCH LOSSES, COSTS, EXPENSES, OR - DAMAGES. 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