openwrtv4/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
Hauke Mehrtens bbe4a57177 brcm-2.4: fix commit r18413 "128MB ram problem"
This was missing in commit r20072

SVN-Revision: 20651
2010-04-01 17:27:59 +00:00

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)
{
}