sparc64 9.0-RC3 install failure

I downloaded the 9.0-RC3 disc1 image for sparc64 and
attempted to install it onto a Netra-T1 105 that is
currently running FreeBSD 8.2-RELEASE.  (1024MB memory,
2x36GB scsi drives, quad-port HME card in the PCI slot)

It failed to install, but not before destroying my partitions.

                       .............Error...............
                       . The checksum for base.txz     .
                       . does not match. It may have   .
                       . become corrupted, and should  .
                       . be redownloaded.              .
                       .................................
                       .           <  OK  >            .
                       .................................

After I exited from the installer, I manually ran sha256 on all
the .txz files in /usr/freebsd-dist:
# sha256 *txz
SHA256 (base.txz) = 23c116d439368f612d7a774435002075e9f11cfe7443190b22868b485a53ffff
SHA256 (doc.txz) = ba5887aac341f5c21293d76df5debfaba812adcd9b65153e977b5db4a347afdc
SHA256 (games.txz) = 0869a7fe76440247e12b915aa7811a7b04d5fa9c8d6d98f3c8defb4c78f390b2
SHA256 (kernel.txz) = 5e9940390fa0ac93806ede8c955e50a5a46e1e8d631509de67f0635999ea9a57
SHA256 (ports.txz) = cd3f2365755bb6c0fe0e8fbec331cae2fd163112ab7fec35aed7ae837d761593
SHA256 (src.txz) = a4d515b25e3938da6c0fd1cf79c2c7057f77df3a8141d599d28373e838923d35

Sure enough, those checksums don't match the contents of the MANIFEST file.

I then took the CD-ROM that I burned, popped it into a amd64 machine
running FreeBSD 8.2-RELEASE, and after mounting the CD-ROM, ran sha256
on the same files.

This time, all the checksums for the .txz files match the contents
of the MANIFEST file.  So, the media that I burned is definately
good when I read it on the amd64 machine.

Has anyone successfully installed the sparc64-RC3 bits from the disc1
ISO onto a sparc64 machine?

-Kurt