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libubb/README: describe how to get rid of competing drivers

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Werner Almesberger 2012-12-31 09:51:00 -03:00
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libubb/README
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@ -121,3 +121,29 @@ Access to timers, interrupts, etc.
include/ubb/regs4740.h gives access to even more registers.
Please consult the JZ4740 Programming Manual for details on
their use.
Competing users of the 8:10 card interface
------------------------------------------
Other programs and kernel drivers may compete for access to the
8:10 card interface. The most common conflicts are with the
kernel drivers for MMC (uSD card) and AT86RF230 (atben).
OpenWRT and JLime start with the MMC driver loaded and active.
To detach the MMC driver, run
# echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind
To re-attach the MMC driver, run
# echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/bind
To detach the AT86RF230 driver, run
# cd /sys/bus/spi/drivers/at86rf230
# echo spi*.0 >unbind
libubb allows multiple programs to open UBB at the same time,
leaving it up to these programs to coordinate their access.