Date: Sun, 22 Dec 2013 11:31:41 +0100 From: Lubomir Rintel Subject: Documentation/: update FireWire debugging documentation The old firewire stack is long dead now and a new version firescope has been released with support for current kernels. Signed-off-by: Lubomir Rintel Cc: Rob Landley Cc: Justin P. Mattock Cc: Bernhard Kaindl Signed-off-by: Andrew Morton Signed-off-by: Stefan Richter --- Documentation/debugging-via-ohci1394.txt | 24 ++++++++------------- Documentation/power/basic-pm-debugging.txt | 2 +- 2 files changed, 10 insertions(+), 16 deletions(-) --- a/Documentation/debugging-via-ohci1394.txt +++ b/Documentation/debugging-via-ohci1394.txt @@ -36,17 +36,13 @@ available (notebooks) or too slow for ex Drivers ------- -The ohci1394 driver in drivers/ieee1394 initializes the OHCI-1394 controllers -to a working state and enables physical DMA by default for all remote nodes. -This can be turned off by ohci1394's module parameter phys_dma=0. - -The alternative firewire-ohci driver in drivers/firewire uses filtered physical +The firewire-ohci driver in drivers/firewire uses filtered physical DMA by default, which is more secure but not suitable for remote debugging. Compile the driver with CONFIG_FIREWIRE_OHCI_REMOTE_DMA (Kernel hacking menu: Remote debugging over FireWire with firewire-ohci) to get unfiltered physical DMA. -Because ohci1394 and firewire-ohci depend on the PCI enumeration to be +Because the firewire-ohci driver depends on the PCI enumeration to be completed, an initialization routine which runs pretty early has been implemented for x86. This routine runs long before console_init() can be called, i.e. before the printk buffer appears on the console. @@ -64,7 +60,7 @@ be used to view the printk buffer of a r Bernhard Kaindl enhanced firescope to support accessing 64-bit machines from 32-bit firescope and vice versa: -- http://halobates.de/firewire/firescope-0.2.2.tar.bz2 +- http://v3.sk/~lkundrak/firescope/ and he implemented fast system dump (alpha version - read README.txt): - http://halobates.de/firewire/firedump-0.1.tar.bz2 @@ -92,11 +88,11 @@ Step-by-step instructions for using fire 1) Verify that your hardware is supported: - Load the ohci1394 or the fw-ohci module and check your kernel logs. + Load the firewire-ohci module and check your kernel logs. You should see a line similar to - ohci1394: fw-host0: OHCI-1394 1.1 (PCI): IRQ=[18] MMIO=[fe9ff800-fe9fffff] - ... Max Packet=[2048] IR/IT contexts=[4/8] + firewire_ohci 0000:15:00.1: added OHCI v1.0 device as card 2, 4 IR + 4 IT + ... contexts, quirks 0x11 when loading the driver. If you have no supported controller, many PCI, CardBus and even some Express cards which are fully compliant to OHCI-1394 @@ -113,20 +109,18 @@ Step-by-step instructions for using fire If an driver is running on both machines you should see a line like - ieee1394: Node added: ID:BUS[0-01:1023] GUID[0090270001b84bba] + firewire_core 0000:15:00.1: created device fw1: GUID 00061b0020105917, S400 on both machines in the kernel log when the cable is plugged in and connects the two machines. 3) Test physical DMA using firescope: - On the debug host, - - load the raw1394 module, - - make sure that /dev/raw1394 is accessible, + On the debug host, make sure that /dev/fw* is accessible, then start firescope: $ firescope - Port 0 (ohci1394) opened, 2 nodes detected + Port 0 (/dev/fw1) opened, 2 nodes detected FireScope --------- --- a/Documentation/power/basic-pm-debugging.txt +++ b/Documentation/power/basic-pm-debugging.txt @@ -172,7 +172,7 @@ you can boot the kernel with the 'no_con kernel messages using the serial console. This may provide you with some information about the reasons of the suspend (resume) failure. Alternatively, it may be possible to use a FireWire port for debugging with firescope -(ftp://ftp.firstfloor.org/pub/ak/firescope/). On x86 it is also possible to +(http://v3.sk/~lkundrak/firescope/). On x86 it is also possible to use the PM_TRACE mechanism documented in Documentation/power/s2ram.txt . 2. Testing suspend to RAM (STR)