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OF: PPC: Check for bus-frequency on '/' first

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As per PowerPC IEEE 1275-1994 binding v1.8 page 13.
This commit is contained in:
François Revol
2013-10-20 20:53:06 +02:00
parent b96e57e885
commit 4c7a310ce1
1 changed files with 13 additions and 2 deletions
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src/system/boot/platform/openfirmware/arch/ppc/cpu.cpp
+13 -2
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@@ -26,6 +26,17 @@
status_t status_t
boot_arch_cpu_init(void) boot_arch_cpu_init(void)
{ {
int32 busFrequency = 0;
int root = of_finddevice("/");
if (root == OF_FAILED) {
printf("boot_arch_cpu_init(): Failed to open \"/\"!\n");
return B_ERROR;
}
of_getprop(root, "clock-frequency", &busFrequency, 4);
// we might find it in /cpus instead
// iterate through the "/cpus" node to find all CPUs // iterate through the "/cpus" node to find all CPUs
int cpus = of_finddevice("/cpus"); int cpus = of_finddevice("/cpus");
if (cpus == OF_FAILED) { if (cpus == OF_FAILED) {
@@ -58,8 +69,8 @@ boot_arch_cpu_init(void)
"frequency!\n"); "frequency!\n");
return B_ERROR; return B_ERROR;
} }
int32 busFrequency; if (busFrequency == 0
if (of_getprop(cpu, "bus-frequency", &busFrequency, 4) && of_getprop(cpu, "bus-frequency", &busFrequency, 4)
== OF_FAILED) { == OF_FAILED) {
printf("boot_arch_cpu_init: Failed to get bus clock " printf("boot_arch_cpu_init: Failed to get bus clock "
"frequency!\n"); "frequency!\n");