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of/flattree: use callback to setup initrd from /chosen

Browse source 
At present, the fdt code sets the kernel-wide initrd_start and
initrd_end variables when parsing /chosen. On ARM, we only set these
once the bootmem has been reserved.

This change adds an arch hook to setup the initrd from the device
tree:

 void early_init_dt_setup_initrd_arch(unsigned long start,
				      unsigned long end);

The arch-specific code can then setup the initrd however it likes.

Compiled on powerpc, with CONFIG_BLK_DEV_INITRD=y and =n.

Signed-off-by: Jeremy Kerr <[email protected]>
Signed-off-by: Grant Likely <[email protected]>
This commit is contained in:
Jeremy Kerr 2010-01-30 01:31:21 -07:00 • committed by Grant Likely
commit 1406bc2f57
4 changed files with 41 additions and 16 deletions
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25
drivers/of/fdt.c
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@ -384,28 +384,23 @@ unsigned long __init unflatten_dt_node(unsigned long mem,
*/
void __init early_init_dt_check_for_initrd(unsigned long node)
{
unsigned long len;
unsigned long start, end, len;
u32 *prop;
pr_debug("Looking for initrd properties... ");
prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
if (prop) {
initrd_start = (unsigned long)
__va(of_read_ulong(prop, len/4));
if (!prop)
return;
start = of_read_ulong(prop, len/4);
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
if (prop) {
initrd_end = (unsigned long)
__va(of_read_ulong(prop, len/4));
initrd_below_start_ok = 1;
} else {
initrd_start = 0;
}
}
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
if (!prop)
return;
end = of_read_ulong(prop, len/4);
pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n",
initrd_start, initrd_end);
early_init_dt_setup_initrd_arch(start, end);
pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
}
#else
inline void early_init_dt_check_for_initrd(unsigned long node)