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authorDavid Gibson <david@gibson.dropbear.id.au>2007-06-13 14:52:59 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-14 22:30:16 +1000
commitb2ba34f370a66d9ed4bbd440e45296ecf3e267d3 (patch)
tree9a743c7b356f5ceba15b3008588126fdced94fb8 /drivers
parent11123346bfba8e65631957c6c25ed1a6ca1b4ffe (diff)
[POWERPC] Derive ebc ranges property from EBC registers
In the device tree for Ebony, the 'ranges' property in the node for the EBC bridge shows the mappings from the chip select / address lines actually used for the EBC peripherals into the address space of the OPB. At present, these mappings are hardcoded in ebony.dts for the mappings set up by the OpenBIOS firmware when it configures the EBC bridge. This replaces the hardcoded mappings with code in the zImage to read the EBC configuration registers and create an appropriate ranges property based on them. This should make the zImage and kernel more robust to changes in firmware configuration. In particular, some of the Ebony's DIP switches can change the effective address of the Flash and other peripherals in OPB space. With this patch, the kernel will be able to cope with at least some of the possible variations. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
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