linux-kernel - Re: EDD still failing on some systems with 2.6.23-rc6-git2

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Date:	Mon, 17 Sep 2007 11:14:08 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: EDD still failing on some systems with 2.6.23-rc6-git2

On 09/14/2007 12:06 PM, H. Peter Anvin wrote:
> Chuck Ebbert wrote:
>> I added debugging code to print a letter for each step in i386 setup,
>> and it gets to 'J', then it hangs:
>>
>>         /* Query EDD information */
>> #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
>>         putchar('J');
>>         query_edd();
>> #endif
>>
>> Multiple reports of this happening on 2.6.23-rc6 can be found at
>> the end of:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=251724
>> https://bugzilla.redhat.com/show_bug.cgi?id=239585
> 
> I just attached a test patch to the bug report shown above.  If someone
> with access to the relevant hardware could test out the patch, I would
> greatly appreciate it.
> 

Still fails. And apparently fails on disk 0, because it hangs right
after printing a zero:

--- linux-2.6.22.noarch.orig/arch/i386/boot/edd.c
+++ linux-2.6.22.noarch/arch/i386/boot/edd.c
@@ -151,6 +151,7 @@ void query_edd(void)
                 * Scan the BIOS-supported hard disks and query EDD
                 * information...
                 */
+               putchar('0' + (devno - 0x80) % 10);
                get_edd_info(devno, &ei);

                if (boot_params.eddbuf_entries < EDDMAXNR) {
-
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