[src/trunk]: src/sys/arch/arm/allwinner Fix (I hope) ram size calculation.

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4b54f4a09f3d
branches:  trunk
changeset: 802348:4b54f4a09f3d
user:      matt <matt%NetBSD.org@localhost>
date:      Thu Sep 11 08:01:31 2014 +0000

description:
Fix (I hope) ram size calculation.

diffstat:

 sys/arch/arm/allwinner/awin_board.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (30 lines):

diff -r a4157e0b12b0 -r 4b54f4a09f3d sys/arch/arm/allwinner/awin_board.c
--- a/sys/arch/arm/allwinner/awin_board.c       Thu Sep 11 07:59:14 2014 +0000
+++ b/sys/arch/arm/allwinner/awin_board.c       Thu Sep 11 08:01:31 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: awin_board.c,v 1.18 2014/09/11 02:16:15 jmcneill Exp $ */
+/*     $NetBSD: awin_board.c,v 1.19 2014/09/11 08:01:31 matt Exp $     */
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -35,7 +35,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(1, "$NetBSD: awin_board.c,v 1.18 2014/09/11 02:16:15 jmcneill Exp $");
+__KERNEL_RCSID(1, "$NetBSD: awin_board.c,v 1.19 2014/09/11 08:01:31 matt Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -231,8 +231,9 @@
        const uint32_t dcr = bus_space_read_4(&awin_bs_tag, awin_core_bsh,
            AWIN_DRAM_OFFSET + AWIN_DRAM_DCR_REG);
 
-       psize_t memsize = __SHIFTOUT(dcr, AWIN_DRAM_DCR_IO_WIDTH);
-       memsize <<= __SHIFTOUT(dcr, AWIN_DRAM_DCR_CHIP_DENSITY) + 28 - 3;
+       psize_t memsize = (__SHIFTOUT(dcr, AWIN_DRAM_DCR_BUS_WIDTH) + 1)
+          / __SHIFTOUT(dcr, AWIN_DRAM_DCR_IO_WIDTH);
+       memsize *= 1 << (__SHIFTOUT(dcr, AWIN_DRAM_DCR_CHIP_DENSITY) + 28 - 3);
 #ifdef VERBOSE_INIT_ARM
        printf("sdram_config = %#x, memsize = %uMB\n", dcr,
            (u_int)(memsize >> 20));