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Limit the maximum size of memory to 3840Mbyte for 4G memory board (NITROGEN6MAX) 

constrained by memory layout of i.MX6 SoC.
This commit is contained in:
ryo 2015-06-01 10:10:56 +00:00
parent c34b2f51ff
commit dd6fa111d8
1 changed files with 12 additions and 2 deletions
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14
sys/arch/arm/imx/imx6_board.c
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@ -1,4 +1,4 @@
/* $NetBSD: imx6_board.c,v 1.3 2015/01/09 09:50:46 ryo Exp $ */
/* $NetBSD: imx6_board.c,v 1.4 2015/06/01 10:10:56 ryo Exp $ */
/*
* Copyright (c) 2012 Genetec Corporation. All rights reserved.
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(1, "$NetBSD: imx6_board.c,v 1.3 2015/01/09 09:50:46 ryo Exp $");
__KERNEL_RCSID(1, "$NetBSD: imx6_board.c,v 1.4 2015/06/01 10:10:56 ryo Exp $");
#include "opt_imx.h"
#include "arml2cc.h"
@ -144,6 +144,16 @@ imx6_memprobe(void)
bitwidth += __SHIFTOUT(ctrl, MMDC1_MDCTL_SDE_1);
bitwidth += (misc & MMDC1_MDMISC_DDR_4_BANK) ? 2 : 3;
/* over 4GB ? limit 3840MB (SoC design limitation) */
if (bitwidth >= 32) {
/*
* XXX: bus_dma and uvm cannot treat 0xffffffff as high address
* correctly because of 0xffffffff + 1 = 0x00000000.
* therefore use 0xffffefff.
*/
return (psize_t)IMX6_MEM_SIZE - PAGE_SIZE;
}
return (psize_t)1 << bitwidth;
}