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[Qemu-devel] [PULL 10/48] net/can: documentation
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 10/48] net/can: documentation |
Date: |
Tue, 13 Feb 2018 13:00:14 +0100 |
From: Pavel Pisa <address@hidden>
Signed-off-by: Pavel Pisa <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
docs/can.txt | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 107 insertions(+)
create mode 100644 docs/can.txt
diff --git a/docs/can.txt b/docs/can.txt
new file mode 100644
index 0000000..a357105
--- /dev/null
+++ b/docs/can.txt
@@ -0,0 +1,107 @@
+QEMU CAN bus emulation support
+==============================
+
+The CAN bus emulation provides mechanism to connect multiple
+emulated CAN controller chips together by one or multiple CAN busses
+(the controller device "canbus" parameter). The individual busses
+can be connected to host system CAN API (at this time only Linux
+SocketCAN is supported).
+
+The concept of busses is generic and different CAN controllers
+can be implemented for it but at this time only SJA1000 chip
+controller is implemented.
+
+The PCI addon card hardware has been selected as the first CAN
+interface to implement because such device can be easily connected
+to systems with different CPU architectures (x86, PowerPC, ARM, etc.).
+
+The project has been initially started in frame of RTEMS GSoC 2013
+slot by Jin Yang under our mentoring The initial idea was to provide generic
+CAN subsystem for RTEMS. But lack of common environment for code and RTEMS
+testing lead to goal change to provide environment which provides complete
+emulated environment for testing and RTEMS GSoC slot has been donated
+to work on CAN hardware emulation on QEMU.
+
+Examples how to use CAN emulation
+=================================
+
+When QEMU with CAN PCI support is compiled then one of the next
+CAN boards can be selected
+
+ (1) CAN bus Kvaser PCI CAN-S (single SJA1000 channel) boad. QEMU startup
options
+ -object can-bus,id=canbus0
+ -device kvaser_pci,canbus=canbus0
+ Add "can-host-socketcan" object to connect device to host system CAN bus
+ -object can-host-socketcan,id=canhost0,if=can0,canbus=canbus0
+
+ (2) CAN bus PCM-3680I PCI (dual SJA1000 channel) emulation
+ -object can-bus,id=canbus0
+ -device pcm3680_pci,canbus0=canbus0,canbus1=canbus0
+
+ another example:
+ -object can-bus,id=canbus0
+ -object can-bus,id=canbus1
+ -device pcm3680_pci,canbus0=canbus0,canbus1=canbus1
+
+ (3) CAN bus MIOe-3680 PCI (dual SJA1000 channel) emulation
+ -device mioe3680_pci,canbus0=canbus0
+
+
+The ''kvaser_pci'' board/device model is compatible with and has been tested
with
+''kvaser_pci'' driver included in mainline Linux kernel.
+The tested setup was Linux 4.9 kernel on the host and guest side.
+Example for qemu-system-x86_64:
+
+ qemu-system-x86_64 -enable-kvm -kernel /boot/vmlinuz-4.9.0-4-amd64 \
+ -initrd ramdisk.cpio \
+ -virtfs local,path=shareddir,security_model=none,mount_tag=shareddir \
+ -object can-bus,id=canbus0 \
+ -object can-host-socketcan,id=canhost0,if=can0,canbus=canbus0 \
+ -device kvaser_pci,canbus=canbus0 \
+ -nographic -append "console=ttyS0"
+
+Example for qemu-system-arm:
+
+ qemu-system-arm -cpu arm1176 -m 256 -M versatilepb \
+ -kernel kernel-qemu-arm1176-versatilepb \
+ -hda rpi-wheezy-overlay \
+ -append "console=ttyAMA0 root=/dev/sda2 ro init=/sbin/init-overlay" \
+ -nographic \
+ -virtfs local,path=shareddir,security_model=none,mount_tag=shareddir \
+ -object can-bus,id=canbus0 \
+ -object can-host-socketcan,id=canhost0,if=can0,canbus=canbus0 \
+ -device kvaser_pci,canbus=canbus0,host=can0 \
+
+The CAN interface of the host system has to be configured for proper
+bitrate and set up. Configuration is not propagated from emulated
+devices through bus to the physical host device. Example configuration
+for 1 Mbit/s
+
+ ip link set can0 type can bitrate 1000000
+ ip link set can0 up
+
+Virtual (host local only) can interface can be used on the host
+side instead of physical interface
+
+ ip link add dev can0 type vcan
+
+The CAN interface on the host side can be used to analyze CAN
+traffic with "candump" command which is included in "can-utils".
+
+ candump can0
+
+Links to other resources
+========================
+
+ (1) Repository with development branch can-pci at Czech Technical University
+ https://gitlab.fel.cvut.cz/canbus/qemu-canbus
+ (2) GitHub repository with can-pci and our other changes included
+ https://gitlab.fel.cvut.cz/canbus/qemu-canbus
+ (3) RTEMS page describing project
+ https://devel.rtems.org/wiki/Developer/Simulators/QEMU/CANEmulation
+ (4) RTLWS 2015 article about the projevt and its use with CANopen emulation
+ http://rtime.felk.cvut.cz/publications/public/rtlws2015-qemu-can.pdf
+ Slides
+
http://rtime.felk.cvut.cz/publications/public/rtlws2015-qemu-can-slides.pdf
+ (5) Linux SocketCAN utilities
+ https://github.com/linux-can/can-utils/
\ No newline at end of file
--
1.8.3.1
- [Qemu-devel] [PULL 00/48] Misc patches for 2018-02-13, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 03/48] hax: Support guest RAM sizes of 4GB or more, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 05/48] net/can: support for connecting to Linux host SocketCAN interface., Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 02/48] make: fix help message reference to bogus V=0 variable, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 01/48] Revert "build-sys: silence make by default or V=0", Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 04/48] net/can: simple messages transport implementation for QEMU, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 07/48] hw/net/can: Kvaser PCI CAN-S (single SJA1000 channel) emulation, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 10/48] net/can: documentation,
Paolo Bonzini <=
- [Qemu-devel] [PULL 09/48] hw/net/can: MIOe-3680 PCI (dual SJA1000 channel) emulation, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 08/48] hw/net/can: PCM-3680I PCI (dual SJA1000 channel) emulation, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 14/48] sdhci: use error_propagate(local_err) in realize(), Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 13/48] build-sys: check static linking of UBSAN, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 17/48] sdhci: add a check_capab_baseclock() qtest, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 06/48] hw/net/can: SJA1000 chip register level emulation for QEMU, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 18/48] sdhci: add a check_capab_sdma() qtest, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 11/48] hw/net/can: interrupt cleanup, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 16/48] sdhci: add check_capab_readonly() qtest, Paolo Bonzini, 2018/02/13
- [Qemu-devel] [PULL 15/48] sdhci: add qtest to check the SD capabilities register, Paolo Bonzini, 2018/02/13