Date: Tue, 16 Nov 2004 02:48:34 +0900 (JST) From: Norikatsu Shigemura <nork@FreeBSD.org> To: qemu-devel@nongnu.org Cc: freebsd-hackers@FreeBSD.org Subject: qemu -boot d -cdrom /dev/cd0 on FreeBSD is not good Message-ID: <200411151748.iAFHmYQ1019323@sakura.ninth-nine.com>
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I tried to install Windows XP SP2 on qemu over FreeBSD 6-current
like following command, but failed.
# qemu -boot d -cdrom /dev/cd0 windows.img
Because find_image_format on qemu/block.c is failed. This
problem can be confirmed like following program.
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#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
int main(void)
{
char buf[2048];
int fd = open("/dev/cd0", O_RDONLY);
if( read(fd, buf, sizeof(buf)) < 0 ) { /* no problem */
perror("[1] read error.");
}
if( read(fd, buf, sizeof(buf) / 2) < 0 ) { /* problem */
perror("[2] read error.");
}
}
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Adhoc-ly, I changed "buf" size to 2048. and confirmed this
problem was fixed.
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static BlockDriver *find_image_format(const char *filename)
{
int fd, ret, score, score_max;
BlockDriver *drv1, *drv;
uint8_t buf[1024]; => buf[2048]
(snip)
ret = read(fd, buf, sizeof(buf));
if (ret < 0) {
close(fd);
return NULL;
}
(snip)
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Obtained from: qemu-0.6.1
I think magic number 2048 is sector size, but I don't know
how to get valid read size. Anyone, do you have any idea?
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