diff options
Diffstat (limited to 'docs/misc/bbb_ehci.md')
| -rw-r--r-- | docs/misc/bbb_ehci.md | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/docs/misc/bbb_ehci.md b/docs/misc/bbb_ehci.md index fdfab7d0..0246a382 100644 --- a/docs/misc/bbb_ehci.md +++ b/docs/misc/bbb_ehci.md @@ -1,7 +1,11 @@ -% EHCI debugging on the BeagleBone Black + +EHCI debugging on the BeagleBone Black +====================================== [Back to previous index](./) + + EHCI debugging ============== @@ -99,7 +103,7 @@ section): ls /lib/modules/3.8.13-bone70/kernel/drivers/usb/gadget/g_dbgp.ko -Unload all other g\_* modules: +Unload all other g\_\* modules: # lsmod # rmmod g_multi @@ -122,8 +126,7 @@ next step. ### Patch BBB's g\_dbgp module (optional, but highly recommended) {#PatchBBBsgdbgpmoduleoptionalbuthighlyrecommended} For the reasons why you need this, see: [EHCI Gadget -Debug](http://www.coreboot.org/EHCI_Gadget_Debug). - +Debug](http://www.coreboot.org/EHCI_Gadget_Debug).\ Make sure that you have cross compiling environment for arm-linux-gnueabihf setup on your *host*. @@ -134,10 +137,10 @@ arm-linux-gnueabihf setup on your *host*. <!-- --> - $ cd \$work_dir + $ cd $work_dir $ git clone https://github.com/beagleboard/kernel.git $ cd kernel - $ git checkout \$mav (see above) + $ 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 @@ -150,7 +153,7 @@ arm-linux-gnueabihf setup on your *host*. 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) - cd kernel (note that this is one more level: you should be in - $work\_dir/kernel/kernel) + \$work\_dir/kernel/kernel) - Apply the patches: <!-- --> @@ -185,18 +188,17 @@ arm-linux-gnueabihf setup on your *host*. - 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) + \$HOME) - copy the freshly compiled usb/gadget dir to /lib/modules/3.8.13-bone70/kernel/drivers/usb - restart BBB -- Remove all g\_* modules (rmmod g\_<>) +- Remove all g\_\* modules (rmmod g\_<>) - modprobpe g\_dbgp ### Configure libreboot with EHCI debug {#ConfigurelibrebootwithEHCIdebug} Libreboot(coreboot) should be configured with debug turned on and to -push debug messages to the EHCI debug port. - +push debug messages to the EHCI debug port.\ If you've downloaded the binary distribution, you can check if it is properly configured in the following way: @@ -207,7 +209,7 @@ properly configured in the following way: <!-- --> - ./cbfstool/i686/cbfstool \$img_path extract -n config -f ./my_config + ./cbfstool/i686/cbfstool $img_path extract -n config -f ./my_config - Make sure that the following params in the config are set as following: @@ -232,7 +234,7 @@ documented [here](https://johnlewis.ie/coreboot-ehci-debug-gadget-demonstration/) (also tested/verified). -Then: +Then:\ CONFIG_CONSOLE_USB=y (Console -> USB dongle console output) @@ -253,8 +255,7 @@ refer to the doc(**FIXME: link** about compiling libreboot. #### Selecting HCD Index and USB Debug port {#SelectingHCDIndexandUSBDebugport} This applies (and works) only if the USB controller that supports debug -(found in the first section) is from Intel. - +(found in the first section) is from Intel.\ 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. @@ -265,12 +266,10 @@ then for CONFIG\_USBDEBUG\_HCD\_INDEX choose 2, otherwise choose 0 . For CONFIG\_USBDEBUG\_DEFAULT\_PORT choose the port from the first section that correspond to the PCI ID -Notes: - +Notes:\ The above is based on the implementation of coreboot/src/southbridge/intel/common/usb\_debug.c : -pci\_ehci\_dbg\_dev() . - +pci\_ehci\_dbg\_dev() .\ 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). @@ -283,7 +282,7 @@ libreboot (for now). - Plug the USB cable in the target's debug port (the one you found in step 1) and BBB's mini-B USB -- Make sure no other then g\_dbgp of the g\_* modules is loaded on +- Make sure no other then g\_dbgp of the g\_\* modules is loaded on your BBB - On the BBB: @@ -296,7 +295,7 @@ libreboot (for now). - You should see debug logs comming on your BBB console Note that this is not permanent on BBB, if you reboot it, you have to -rmmod g\_* and modprobe g\_dbgp +rmmod g\_\* and modprobe g\_dbgp ### Eneble EHCI Debug on the target's kernel (optional, recommended) {#EnebleEHCIDebugonthetargetskerneloptionalrecommended} @@ -355,8 +354,9 @@ Interface](http://cs.usfca.edu/~cruse/cs698s10/) 3. Patch and compule g\_dbgp on BBB instead cross-compile 4. Find a simple way to send debug messages from targets userland -Copyright © 2015 Alex David <opdecirkel@gmail.com> + +Copyright © 2015 Alex David <opdecirkel@gmail.com>\ Permission is granted to copy, distribute and/or modify this document under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license or any later version published by Creative |