Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'firewire-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
Pull firewire fix from Stefan Richter:
"A regression fix for the IEEE 1394 subsystem: re-enable IRQ-based
asynchronous request reception at addresses below 128 TB"
* tag 'firewire-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
firewire: revert to 4 GB RDMA, fix protocols using Memory Space
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Documentation/debugging-via-ohci1394.txt
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Documentation/debugging-via-ohci1394.txt
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With most FireWire controllers, memory access is limited to the low 4 GB
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of physical address space. This can be a problem on IA64 machines where
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memory is located mostly above that limit, but it is rarely a problem on
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more common hardware such as x86, x86-64 and PowerPC. However, at least
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Agere/LSI FW643e and FW643e2 controllers are known to support access to
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physical addresses above 4 GB.
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more common hardware such as x86, x86-64 and PowerPC.
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At least LSI FW643e and FW643e2 controllers are known to support access to
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physical addresses above 4 GB, but this feature is currently not enabled by
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Linux.
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Together with a early initialization of the OHCI-1394 controller for debugging,
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this facility proved most useful for examining long debugs logs in the printk
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compliant, they are based on TI PCILynx chips and require drivers for Win-
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dows operating systems.
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The mentioned kernel log message contains ">4 GB phys DMA" in case of
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OHCI-1394 controllers which support accesses above this limit.
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The mentioned kernel log message contains the string "physUB" if the
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controller implements a writable Physical Upper Bound register. This is
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required for physical DMA above 4 GB (but not utilized by Linux yet).
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2) Establish a working FireWire cable connection:
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drivers/firewire/core.h
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drivers/firewire/core.h
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#define LOCAL_BUS 0xffc0
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/* arbitrarily chosen maximum range for physical DMA: 128 TB */
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#define FW_MAX_PHYSICAL_RANGE (128ULL << 40)
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/* OHCI-1394's default upper bound for physical DMA: 4 GB */
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#define FW_MAX_PHYSICAL_RANGE (1ULL << 32)
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void fw_core_handle_request(struct fw_card *card, struct fw_packet *request);
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void fw_core_handle_response(struct fw_card *card, struct fw_packet *packet);