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/freebsd-11-stable/sys/arm/ti/cpsw/
H A Dif_cpsw.cdiff 248407 Sun Mar 17 01:08:49 MDT 2013 ian Add a macro that gets the physical address of a memory mapped device
register from a bus space resource.

Note that this macro is just for ARM, and is intended to have a short
lifespan. The DMA engines in some SoCs need the physical address of a
memory-mapped device register as one of the arguments for the transfer.
Several scattered ad-hoc solutions have been converted to use this macro,
which now also serves to mark the places where a more complete fix needs
to be applied (after that fix has been designed).
/freebsd-11-stable/sys/arm/broadcom/bcm2835/
H A Dbcm2835_sdhci.cdiff 248407 Sun Mar 17 01:08:49 MDT 2013 ian Add a macro that gets the physical address of a memory mapped device
register from a bus space resource.

Note that this macro is just for ARM, and is intended to have a short
lifespan. The DMA engines in some SoCs need the physical address of a
memory-mapped device register as one of the arguments for the transfer.
Several scattered ad-hoc solutions have been converted to use this macro,
which now also serves to mark the places where a more complete fix needs
to be applied (after that fix has been designed).

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