€• K      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ2/translations/zh_CN/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ2/translations/zh_TW/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ2/translations/it_IT/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ2/translations/ja_JP/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ2/translations/ko_KR/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ2/translations/sp_SP/driver-api/usb/usb3-debug-port”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒUSB3 debug port”h]”hŒUSB3 debug port”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒL/var/lib/git/docbuild/linux/Documentation/driver-api/usb/usb3-debug-port.rst”h KubhŒ
field_list”“”)”}”(hhh]”(hŒfield”“”)”}”(hhh]”(hŒ
field_name”“”)”}”(hŒAuthor”h]”hŒAuthor”…””}”(hhÃhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhh¾hŸh¶h K ubhŒ
field_body”“”)”}”(hŒ#Lu Baolu <baolu.lu@linux.intel.com>”h]”hŒ	paragraph”“”)”}”(hhÕh]”(hŒ
Lu Baolu <”…””}”(hhÙhžhhŸNh NubhŒ	reference”“”)”}”(hŒbaolu.lu@linux.intel.com”h]”hŒbaolu.lu@linux.intel.com”…””}”(hhâhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”Œmailto:baolu.lu@linux.intel.com”uh1hàhhÙubhŒ>”…””}”(hhÙhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h KhhÓubah}”(h]”h ]”h"]”h$]”h&]”uh1hÑhh¾ubeh}”(h]”h ]”h"]”h$]”h&]”uh1h¼hŸh¶h Khh¹hžhubh½)”}”(hhh]”(hÂ)”}”(hŒDate”h]”hŒDate”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÁhj  hŸh¶h K ubhÒ)”}”(hŒMarch 2017
”h]”hØ)”}”(hŒ
March 2017”h]”hŒ
March 2017”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1hÑhj  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1h¼hŸh¶h Khh¹hžhubeh}”(h]”h ]”h"]”h$]”h&]”uh1h·hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒGENERAL”h]”hŒGENERAL”…””}”(hj@  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj=  hžhhŸh¶h K	ubhØ)”}”(hŒ=This is a HOWTO for using the USB3 debug port on x86 systems.”h]”hŒ=This is a HOWTO for using the USB3 debug port on x86 systems.”…””}”(hjN  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Khj=  hžhubhØ)”}”(hŒWBefore using any kernel debugging functionality based on USB3
debug port, you need to::”h]”hŒVBefore using any kernel debugging functionality based on USB3
debug port, you need to:”…””}”(hj\  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Khj=  hžhubhŒliteral_block”“”)”}”(hŒ®1) check whether any USB3 debug port is available in
   your system;
2) check which port is used for debugging purposes;
3) have a USB 3.0 super-speed A-to-A debugging cable.”h]”hŒ®1) check whether any USB3 debug port is available in
   your system;
2) check which port is used for debugging purposes;
3) have a USB 3.0 super-speed A-to-A debugging cable.”…””}”hjl  sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1jj  hŸh¶h Khj=  hžhubeh}”(h]”Œgeneral”ah ]”h"]”Œgeneral”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K	ubh¢)”}”(hhh]”(h§)”}”(hŒINTRODUCTION”h]”hŒINTRODUCTION”…””}”(hj‡  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj„  hžhhŸh¶h KubhØ)”}”(hŒªThe xHCI debug capability (DbC) is an optional but standalone
functionality provided by the xHCI host controller. The xHCI
specification describes DbC in the section 7.6.”h]”hŒªThe xHCI debug capability (DbC) is an optional but standalone
functionality provided by the xHCI host controller. The xHCI
specification describes DbC in the section 7.6.”…””}”(hj•  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Khj„  hžhubhØ)”}”(hXX  When DbC is initialized and enabled, it will present a debug
device through the debug port (normally the first USB3
super-speed port). The debug device is fully compliant with
the USB framework and provides the equivalent of a very high
performance full-duplex serial link between the debug target
(the system under debugging) and a debug host.”h]”hXX  When DbC is initialized and enabled, it will present a debug
device through the debug port (normally the first USB3
super-speed port). The debug device is fully compliant with
the USB framework and provides the equivalent of a very high
performance full-duplex serial link between the debug target
(the system under debugging) and a debug host.”…””}”(hj£  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Khj„  hžhubeh}”(h]”Œintroduction”ah ]”h"]”Œintroduction”ah$]”h&]”uh1h¡hh£hžhhŸh¶h Kubh¢)”}”(hhh]”(h§)”}”(hŒEARLY PRINTK”h]”hŒEARLY PRINTK”…””}”(hj¼  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj¹  hžhhŸh¶h K$ubhØ)”}”(hX*  DbC has been designed to log early printk messages. One use for
this feature is kernel debugging. For example, when your machine
crashes very early before the regular console code is initialized.
Other uses include simpler, lockless logging instead of a full-
blown printk console driver and klogd.”h]”hX*  DbC has been designed to log early printk messages. One use for
this feature is kernel debugging. For example, when your machine
crashes very early before the regular console code is initialized.
Other uses include simpler, lockless logging instead of a full-
blown printk console driver and klogd.”…””}”(hjÊ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K&hj¹  hžhubhØ)”}”(hŒ–On the debug target system, you need to customize a debugging
kernel with CONFIG_EARLY_PRINTK_USB_XDBC enabled. And, add below
kernel boot parameter::”h]”hŒ•On the debug target system, you need to customize a debugging
kernel with CONFIG_EARLY_PRINTK_USB_XDBC enabled. And, add below
kernel boot parameter:”…””}”(hjØ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K,hj¹  hžhubjk  )”}”(hŒ"earlyprintk=xdbc"”h]”hŒ"earlyprintk=xdbc"”…””}”hjæ  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h K0hj¹  hžhubhØ)”}”(hŒ‘If there are multiple xHCI controllers in your system, you can
append a host controller index to this kernel parameter. This
index starts from 0.”h]”hŒ‘If there are multiple xHCI controllers in your system, you can
append a host controller index to this kernel parameter. This
index starts from 0.”…””}”(hjô  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K2hj¹  hžhubhØ)”}”(hŒ±Current design doesn't support DbC runtime suspend/resume. As
the result, you'd better disable runtime power management for
USB subsystem by adding below kernel boot parameter::”h]”hŒ´Current design doesnâ€™t support DbC runtime suspend/resume. As
the result, youâ€™d better disable runtime power management for
USB subsystem by adding below kernel boot parameter:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K6hj¹  hžhubjk  )”}”(hŒ"usbcore.autosuspend=-1"”h]”hŒ"usbcore.autosuspend=-1"”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h K:hj¹  hžhubhØ)”}”(hŒîBefore starting the debug target, you should connect the debug
port to a USB port (root port or port of any external hub) on
the debug host. The cable used to connect these two ports
should be a USB 3.0 super-speed A-to-A debugging cable.”h]”hŒîBefore starting the debug target, you should connect the debug
port to a USB port (root port or port of any external hub) on
the debug host. The cable used to connect these two ports
should be a USB 3.0 super-speed A-to-A debugging cable.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K<hj¹  hžhubhØ)”}”(hX"  During early boot of the debug target, DbC will be detected and
initialized. After initialization, the debug host should be able
to enumerate the debug device in debug target. The debug host
will then bind the debug device with the usb_debug driver module
and create the /dev/ttyUSB device.”h]”hX"  During early boot of the debug target, DbC will be detected and
initialized. After initialization, the debug host should be able
to enumerate the debug device in debug target. The debug host
will then bind the debug device with the usb_debug driver module
and create the /dev/ttyUSB device.”…””}”(hj,  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h KAhj¹  hžhubhØ)”}”(hŒrIf the debug device enumeration goes smoothly, you should be able
to see below kernel messages on the debug host::”h]”hŒqIf the debug device enumeration goes smoothly, you should be able
to see below kernel messages on the debug host:”…””}”(hj:  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h KGhj¹  hžhubjk  )”}”(hXI  # tail -f /var/log/kern.log
[ 1815.983374] usb 4-3: new SuperSpeed USB device number 4 using xhci_hcd
[ 1815.999595] usb 4-3: LPM exit latency is zeroed, disabling LPM.
[ 1815.999899] usb 4-3: New USB device found, idVendor=1d6b, idProduct=0004
[ 1815.999902] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1815.999903] usb 4-3: Product: Remote GDB
[ 1815.999904] usb 4-3: Manufacturer: Linux
[ 1815.999905] usb 4-3: SerialNumber: 0001
[ 1816.000240] usb_debug 4-3:1.0: xhci_dbc converter detected
[ 1816.000360] usb 4-3: xhci_dbc converter now attached to ttyUSB0”h]”hXI  # tail -f /var/log/kern.log
[ 1815.983374] usb 4-3: new SuperSpeed USB device number 4 using xhci_hcd
[ 1815.999595] usb 4-3: LPM exit latency is zeroed, disabling LPM.
[ 1815.999899] usb 4-3: New USB device found, idVendor=1d6b, idProduct=0004
[ 1815.999902] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1815.999903] usb 4-3: Product: Remote GDB
[ 1815.999904] usb 4-3: Manufacturer: Linux
[ 1815.999905] usb 4-3: SerialNumber: 0001
[ 1816.000240] usb_debug 4-3:1.0: xhci_dbc converter detected
[ 1816.000360] usb 4-3: xhci_dbc converter now attached to ttyUSB0”…””}”hjH  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h KJhj¹  hžhubhØ)”}”(hŒ£You can use any communication program, for example minicom, to
read and view the messages. Below simple bash scripts can help
you to check the sanity of the setup.”h]”hŒ£You can use any communication program, for example minicom, to
read and view the messages. Below simple bash scripts can help
you to check the sanity of the setup.”…””}”(hjV  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h KUhj¹  hžhubjk  )”}”(hŒØ===== start of bash scripts =============
#!/bin/bash

while true ; do
        while [ ! -d /sys/class/tty/ttyUSB0 ] ; do
                :
        done
cat /dev/ttyUSB0
done
===== end of bash scripts ===============”h]”hŒØ===== start of bash scripts =============
#!/bin/bash

while true ; do
        while [ ! -d /sys/class/tty/ttyUSB0 ] ; do
                :
        done
cat /dev/ttyUSB0
done
===== end of bash scripts ===============”…””}”hjd  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  Œforce”‰Œlanguage”Œsh”Œhighlight_args”}”uh1jj  hŸh¶h KYhj¹  hžhubeh}”(h]”Œearly-printk”ah ]”h"]”Œearly printk”ah$]”h&]”uh1h¡hh£hžhhŸh¶h K$ubh¢)”}”(hhh]”(h§)”}”(hŒ
Serial TTY”h]”hŒ
Serial TTY”…””}”(hj‚  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hj  hžhhŸh¶h KgubhØ)”}”(hŒmThe DbC support has been added to the xHCI driver. You can get a
debug device provided by the DbC at runtime.”h]”hŒmThe DbC support has been added to the xHCI driver. You can get a
debug device provided by the DbC at runtime.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Kihj  hžhubhØ)”}”(hŒÔIn order to use this, you need to make sure your kernel has been
configured to support USB_XHCI_DBGCAP. A sysfs attribute under
the xHCI device node is used to enable or disable DbC. By default,
DbC is disabled::”h]”hŒÓIn order to use this, you need to make sure your kernel has been
configured to support USB_XHCI_DBGCAP. A sysfs attribute under
the xHCI device node is used to enable or disable DbC. By default,
DbC is disabled:”…””}”(hjž  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Klhj  hžhubjk  )”}”(hŒ?root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
disabled”h]”hŒ?root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
disabled”…””}”hj¬  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h Kqhj  hžhubhØ)”}”(hŒ'Enable DbC with the following command::”h]”hŒ&Enable DbC with the following command:”…””}”(hjº  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Kthj  hžhubjk  )”}”(hŒ@root@target:/sys/bus/pci/devices/0000:00:14.0# echo enable > dbc”h]”hŒ@root@target:/sys/bus/pci/devices/0000:00:14.0# echo enable > dbc”…””}”hjÈ  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h Kvhj  hžhubhØ)”}”(hŒ(You can check the DbC state at anytime::”h]”hŒ'You can check the DbC state at anytime:”…””}”(hjÖ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h Kxhj  hžhubjk  )”}”(hŒ>root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
enabled”h]”hŒ>root@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
enabled”…””}”hjä  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h Kzhj  hžhubhØ)”}”(hŒ¾Connect the debug target to the debug host with a USB 3.0 super-
speed A-to-A debugging cable. You can see /dev/ttyDBC0 created
on the debug target. You will see below kernel message lines::”h]”hŒ½Connect the debug target to the debug host with a USB 3.0 super-
speed A-to-A debugging cable. You can see /dev/ttyDBC0 created
on the debug target. You will see below kernel message lines:”…””}”(hjò  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K}hj  hžhubjk  )”}”(hŒÖroot@target: tail -f /var/log/kern.log
[  182.730103] xhci_hcd 0000:00:14.0: DbC connected
[  191.169420] xhci_hcd 0000:00:14.0: DbC configured
[  191.169597] xhci_hcd 0000:00:14.0: DbC now attached to /dev/ttyDBC0”h]”hŒÖroot@target: tail -f /var/log/kern.log
[  182.730103] xhci_hcd 0000:00:14.0: DbC connected
[  191.169420] xhci_hcd 0000:00:14.0: DbC configured
[  191.169597] xhci_hcd 0000:00:14.0: DbC now attached to /dev/ttyDBC0”…””}”hj   sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h Khj  hžhubhØ)”}”(hŒ3Accordingly, the DbC state has been brought up to::”h]”hŒ2Accordingly, the DbC state has been brought up to:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K†hj  hžhubjk  )”}”(hŒAroot@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
configured”h]”hŒAroot@target:/sys/bus/pci/devices/0000:00:14.0# cat dbc
configured”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h Kˆhj  hžhubhØ)”}”(hŒoOn the debug host, you will see the debug device has been enumerated.
You will see below kernel message lines::”h]”hŒnOn the debug host, you will see the debug device has been enumerated.
You will see below kernel message lines:”…””}”(hj*  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh¶h K‹hj  hžhubjk  )”}”(hXö  root@host: tail -f /var/log/kern.log
[   79.454780] usb 2-2.1: new SuperSpeed USB device number 3 using xhci_hcd
[   79.475003] usb 2-2.1: LPM exit latency is zeroed, disabling LPM.
[   79.475389] usb 2-2.1: New USB device found, idVendor=1d6b, idProduct=0010
[   79.475390] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   79.475391] usb 2-2.1: Product: Linux USB Debug Target
[   79.475392] usb 2-2.1: Manufacturer: Linux Foundation
[   79.475393] usb 2-2.1: SerialNumber: 0001”h]”hXö  root@host: tail -f /var/log/kern.log
[   79.454780] usb 2-2.1: new SuperSpeed USB device number 3 using xhci_hcd
[   79.475003] usb 2-2.1: LPM exit latency is zeroed, disabling LPM.
[   79.475389] usb 2-2.1: New USB device found, idVendor=1d6b, idProduct=0010
[   79.475390] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   79.475391] usb 2-2.1: Product: Linux USB Debug Target
[   79.475392] usb 2-2.1: Manufacturer: Linux Foundation
[   79.475393] usb 2-2.1: SerialNumber: 0001”…””}”hj8  sbah}”(h]”h ]”h"]”h$]”h&]”jz  j{  uh1jj  hŸh¶h KŽhj  hžhubhØ)”}”(hŒwThe debug device works now. You can use any communication or debugging
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