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When an Integrator board has less than 256M of SDRAM fitted, the 

memory that is "obscured" by the SSRAM is visible at a wrapped address.
So we can use the full amount of SDRAM in almost all cases.
This commit is contained in:
rearnsha 2003-09-06 10:28:26 +00:00
parent 15f5c8f7db
commit b867034038
1 changed files with 11 additions and 4 deletions
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15
sys/arch/evbarm/integrator/integrator_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: integrator_machdep.c,v 1.45 2003/09/06 10:21:19 rearnsha Exp $ */
/* $NetBSD: integrator_machdep.c,v 1.46 2003/09/06 10:28:26 rearnsha Exp $ */
/*
* Copyright (c) 2001,2002 ARM Ltd
@ -68,7 +68,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: integrator_machdep.c,v 1.45 2003/09/06 10:21:19 rearnsha Exp $");
__KERNEL_RCSID(0, "$NetBSD: integrator_machdep.c,v 1.46 2003/09/06 10:28:26 rearnsha Exp $");
#include "opt_ddb.h"
#include "opt_pmap_debug.h"
@ -864,9 +864,15 @@ integrator_sdram_bounds(paddr_t *memstart, psize_t *memsize)
{
volatile unsigned long *cm_sdram
= (volatile unsigned long *)0x10000020;
volatile unsigned long *cm_stat
= (volatile unsigned long *)0x10000010;
*memstart = 0;
*memstart = *cm_stat & 0x00ff0000;
/*
* Although the SSRAM overlaps the SDRAM, we can use the wrap-around
* to access the entire bank.
*/
switch ((*cm_sdram >> 2) & 0x7)
{
case 0:
@ -882,7 +888,8 @@ integrator_sdram_bounds(paddr_t *memstart, psize_t *memsize)
*memsize = 128 * 1024 * 1024;
break;
case 4:
*memsize = 256 * 1024 * 1024;
/* With 256M of memory there is no wrap-around. */
*memsize = 256 * 1024 * 1024 - *memstart;
break;
default:
printf("CM_SDRAM retuns unknown value, using 16M\n");