On Fri, 15 Feb 2002, Atsushi Nemoto wrote: > Note that SYNC on TX39/H and TX39/H2 does not flush a write buffer. That's perfectly fine -- it does not need to. It's only a synchronization point. > Some operation (for example, bc0f loop) are required to flush a write > buffer. This is bad, though. No extra operations must be needed. After a "sync" the buffer should be written back as soon as not doing so would be visible externally. IOW, two consecutive writes separated by a "sync" need not imply a write-back, but as soon as a read happens a preceding write-back is a must. It sounds weird: it looks like "sync" is useless and basically a "nop". If this is the case the processors need their own wbflush() implementation. Can you point to specific chapters of specifications that document it? -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
