From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <jay_chen@alphanetworks.com>
Received: from Sweeper2.alphanetworks.com (sweeper2.alphanetworks.com
	[210.202.42.140]) by ozlabs.org (Postfix) with ESMTP id 0EA65DDEE9
	for <linuxppc-embedded@ozlabs.org>;
	Tue, 12 Feb 2008 19:54:03 +1100 (EST)
From: "jay_chen" <jay_chen@alphanetworks.com>
To: <linuxppc-embedded@ozlabs.org>
Subject: populate_rootfs fail
Date: Tue, 12 Feb 2008 16:53:47 +0800
MIME-Version: 1.0
Message-ID: <OF66FDCEB1.DBBF4F1E-ON482573ED.0030E325@alphanetworks.com>
Content-Type: text/plain;
	charset="us-ascii"
List-Id: Linux on Embedded PowerPC Developers Mail List
	<linuxppc-embedded.ozlabs.org>
List-Unsubscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-embedded>,
	<mailto:linuxppc-embedded-request@ozlabs.org?subject=unsubscribe>
List-Archive: <http://ozlabs.org/pipermail/linuxppc-embedded>
List-Post: <mailto:linuxppc-embedded@ozlabs.org>
List-Help: <mailto:linuxppc-embedded-request@ozlabs.org?subject=help>
List-Subscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-embedded>,
	<mailto:linuxppc-embedded-request@ozlabs.org?subject=subscribe>

Hello all:

I am using mpc8548, kernel 2.6.14.5, and uboot as boot loader.
When I upgrade ram from 512MB to 2G, my kernel can't boot anymore.
(I pass mem=2048M to kernel in uboot now)

It always dies in exec sys_write( ) in populate_rootfs( ).
I did more tests about this and I found that sys_write( ) could write only
about 4MB in 2G ram case.
(My initrd is about 19MB, initrd_start  : 0xCE7C7000, initrd_end  :
0xCFAAF289, initrd_end - initrd_start  : 0x012E8289 ==> about 19MB)
Could anybody give me some hints?
Is this issue related to the location of  "/initrd.image"? Could I control
it?
Is there any size limit in ppc arch about ramdisk/initrd?

Thanks for help.

                  Jay...

void __init populate_rootfs(void)
{
	char *err;
               ...
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start) {
                                 ...
		printk("it isn't (%s); looks like an initrd\n", err);
		fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 700);
		if (fd >= 0) {
			sys_write(fd, (char *)initrd_start,
					initrd_end - initrd_start);
			sys_close(fd);
			free_initrd();
		}
	}
#endif
}