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Check the status port after waiting for DRQ; some drives seem to be very

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slow coming off the bus (eg. Iomega's ATAPI Zip).  Failure to do
this results in a false probe of an ATAPI device with garbage
data.
This commit is contained in:
Mike Smith 1998-01-27 16:45:23 +00:00
parent 3bbee664ba
commit facf6a3fbe
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=32825
1 changed files with 9 additions and 0 deletions
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9
sys/i386/isa/atapi.c
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@ -422,6 +422,15 @@ static struct atapi_params *atapi_probe (int port, int unit)
return (0);
}
/* check that DRQ isn't a fake */
if (inb (port + AR_STATUS) == 0xff) {
print (("atapiX.%d at 0x%x: no device\n", unit, port));
if (unit == 1)
/* Select unit 0. */
outb (port + AR_DRIVE, ARD_DRIVE0);
return (0);
}
/* Obtain parameters. */
insw (port + AR_DATA, tb, sizeof(tb) / sizeof(short));