Date: Thu, 14 Jul 2011 18:58:18 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/boot/i386/zfsboot zfsldr.S Message-ID: <201107141858.p6EIwUmB030496@repoman.freebsd.org>
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jhb 2011-07-14 18:58:18 UTC FreeBSD src repository Modified files: (Branch: RELENG_8) sys/boot/i386/zfsboot zfsldr.S Log: SVN rev 224033 on 2011-07-14 18:58:18Z by jhb MFC 223477,223597,223611: - The recent change to increase the zfsboot size to 64k made a few BIOSes unhappy (probably they don't handle crossing the 64k boundary, etc.). Fix this by changing zfsldr to use a loop reading from the disk one sector at a time. To avoid trashing the saved copy of the MBR which is used for disk I/O, read zfsboot2 at address 0x9000. This has the advantage that BTX no longer needs to be relocated as it is read into the correct location. However, the loop to relocate zfsboot2.bin can now cross a 64k boundary, so change it to use relative segments instead. (This will need further work if zfsboot2.bin ever exceeds 64k.) While here, stop storing a relocated copy of zfsldr at 0x700. This was only used by the xread hack which has recently been removed (and even that use was dubious). Also, include the BIOS error code as hex when reporting read errors to aid in debugging. - Remove the fake BPB from zfsldr. zfsldr doesn't support booting from floppies, so it will not be used as the start of an emulated floppy image on a bootable CD which is what the fake BPB was used for. - Only check that EDD packet mode is available once at the start of zfsldr rather than for each disk sector now that we read data in one sector at a time. As a result, collapse the remaining bits of read up into nread and rename nread to read. Revision Changes Path 1.1.4.4 +86 -136 src/sys/boot/i386/zfsboot/zfsldr.S
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