cvs commit: src/sys/boot/i386/boot2 boot2.c

Poul-Henning Kamp phk at
Sat Sep 18 00:08:08 PDT 2004

In message <200409180207.i8I27044010045 at>, John Baldwin writ
>jhb         2004-09-18 02:07:00 UTC
>  FreeBSD src repository
>  Modified files:
>    sys/boot/i386/boot2  boot2.c 
>  Log:
>  A long, long time ago in a CVS branch far away (specifically, HEAD prior
>  to 4.0 and RELENG_3), the BTX mini-kernel used paging rather than flat
>  mode and clients were limited to a virtual address space of 16 megabytes.
>  Because of this limitation, boot2 silently masked all physical addresses
>  in any binaries it loaded so that they were always loaded into the first
>  16 Meg.  Since BTX no longer has this limitation (and hasn't for a long
>  time), remove the masking from boot2.  This allows boot2 to load kernels
>  larger than about 12 to 14 meg (12 for non-PAE, 14 for PAE).

Does this also give us better space for isa_dma bounce buffers ?

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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