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openrisc: enable passing of flattened device tree pointer

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This patch enables passing a fdt pointer to the kernel.

This makes for the kernel parameter API:

void kernel(unsigned int fdt);

which, in accordance with the OpenRISC ABI results in:
r3 = pointer to fdt

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
This commit is contained in:
Stefan Kristiansson 2011-11-10 16:38:29 +01:00 • committed by Jonas Bonn
parent 2e1c958de4
commit dec830189e
2 changed files with 25 additions and 10 deletions
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18
arch/openrisc/kernel/setup.c
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@ -207,18 +207,18 @@ void __init setup_cpuinfo(void)
* Handles the pointer to the device tree that this kernel is to use
* for establishing the available platform devices.
*
* For now, this is limited to using the built-in device tree. In the future,
* it is intended that this function will take a pointer to the device tree
* that is potentially built-in, but potentially also passed in by the
* bootloader, or discovered by some equally clever means...
* Falls back on built-in device tree in case null pointer is passed.
*/
void __init or32_early_setup(void)
void __init or32_early_setup(unsigned int fdt)
{
early_init_devtree(__dtb_start);
printk(KERN_INFO "Compiled-in FDT at 0x%p\n", __dtb_start);
if (fdt) {
early_init_devtree((void*) fdt);
printk(KERN_INFO "FDT at 0x%08x\n", fdt);
} else {
early_init_devtree(__dtb_start);
printk(KERN_INFO "Compiled-in FDT at %p\n", __dtb_start);
}
}
static int __init openrisc_device_probe(void)