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Red Hat Bugzilla – Attachment 195991 Details for
Bug 239585
F8 CD/DVD hangs with message "Ready"
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[patch]
Proposed patch for testing
edd-maxdrive.patch (text/plain), 1.04 KB, created by
H. Peter Anvin
on 2007-09-14 16:01:38 UTC
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Description:
Proposed patch for testing
Filename:
MIME Type:
Creator:
H. Peter Anvin
Created:
2007-09-14 16:01:38 UTC
Size:
1.04 KB
patch
obsolete
>diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c >index bd138e4..fad5f6b 100644 >--- a/arch/i386/boot/edd.c >+++ b/arch/i386/boot/edd.c >@@ -129,7 +129,7 @@ void query_edd(void) > char eddarg[8]; > int do_mbr = 1; > int do_edd = 1; >- int devno; >+ int devno, maxdrive; > struct edd_info ei, *edp; > u32 *mbrptr; > >@@ -145,8 +145,22 @@ void query_edd(void) > > if (!do_edd) > return; >- >- for (devno = 0x80; devno < 0x80+EDD_MBR_SIG_MAX; devno++) { >+ >+ /* Query the number of drives. This prevents the probe >+ from wandering into CD-ROMs and nonexistent devices; >+ some machines have been known to hang if nonexistent >+ devices are probed. >+ >+ Ralf Brown (inter61) seems to imply that BIOS location >+ 40:75 is more reliable than the return value from INT 13h, >+ AH=08h, so go with that. */ >+ >+ set_fs(0); >+ maxdrive = rdfs8(0x475)|0x80; >+ if (maxdrive > 0x80+EDD_MBR_SIG_MAX) >+ maxdrive = 0x80+EDD_MBR_SIG_MAX; >+ >+ for (devno = 0x80; devno < maxdrive; devno++) { > /* > * Scan the BIOS-supported hard disks and query EDD > * information...
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bug 239585
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