56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/*
|
|
* Early initialization code for BCM94710 boards
|
|
*
|
|
* Copyright 2004, Broadcom Corporation
|
|
* All Rights Reserved.
|
|
*
|
|
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
|
|
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
|
|
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <asm/bootinfo.h>
|
|
|
|
void __init
|
|
prom_init(int argc, const char **argv)
|
|
{
|
|
unsigned long mem;
|
|
unsigned long max;
|
|
|
|
mips_machgroup = MACH_GROUP_BRCM;
|
|
mips_machtype = MACH_BCM947XX;
|
|
|
|
/* Figure out memory size by finding aliases
|
|
*
|
|
* BCM47XX uses 128MB for addressing the ram, if the system contains
|
|
* less that that amount of ram it remaps the ram more often into the
|
|
* available space.
|
|
* Accessing memory after 128MB will cause an exception.
|
|
* max contains the biggest possible address supported by the platform.
|
|
* If the method wants to try something above we assume 128MB ram.
|
|
*/
|
|
max = ((unsigned long)(prom_init) | ((128 << 20) - 1));
|
|
for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
|
|
if (((unsigned long)(prom_init) + mem) > max) {
|
|
mem = (128 << 20);
|
|
printk("assume 128MB RAM\n");
|
|
break;
|
|
}
|
|
if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
|
|
*(unsigned long *)(prom_init))
|
|
break;
|
|
}
|
|
|
|
add_memory_region(0, mem, BOOT_MEM_RAM);
|
|
}
|
|
|
|
void __init
|
|
prom_free_prom_memory(void)
|
|
{
|
|
}
|