Linux-kernel mailing list archive 1999-51,: RE: Possible workaround for buggy E801 call in 2.2.x

# RE: Possible workaround for buggy E801 call in 2.2.x

nathan.zook@amd.com
Sun, 19 Dec 1999 17:39:52 -0600

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This is great! I've been so focused on validating the e820 return that I
hadn't worried about e801. Could you send a pointer to the documentation?

(We are talking about having e801 off by default, but users have been known
to enable options they shouldn't on one or two occasions.)

Nathan

> -----Original Message-----
> From: Prashant TR [SMTP:prashant_tr@yahoo.com]
> Sent: Sunday, December 19, 1999 1:56 AM
> To: Zook, Nathan
> Cc: set@pobox.com; Linux Kernel Mailing list
> Subject: Possible workaround for buggy E801 call in 2.2.x
>
> Hi Nathan and Paul,
>
> Ok. The E801 call is broken on some BIOSes. So, can't we have
> an arrangement like this:
>
> The docs for E801 mention that the max. that can be returned in
> AX is 0x3c00.
>
> So,
>
> 1> If the E801 call returns AX < 0x3c00, then the system has < 64M
> RAM (or the BIOS is broken) and the standard 88h call should give
> the memory size.
>
> 2> If E801 returns AX > 0x3c00, then the BIOS is definitely broken
> and again the standard 88h call should give the correct memory
> size.
>
> In short, if AX!=0x3c00 after executing E801, then the standard
> call can be used.
>
> I guess this can be a good workaround and can give nearly 100%
> results.
>
> Prashant
> ------------------------------------------
> One pound of learning requires ten pounds of
> common sense to apply it.
>
>
>
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