On Wed, Aug 12, 2009 at 11:27:16PM +0400, Alexey Starikovskiy wrote:
> May be drop support for 2.4 as well? I think all the above arguments 
> still apply...

The Linux 2.6 timeline: Released December 2003
In Red Hat: Fedora Core 2 (2004)
In Debian: 3.1 "Sarge" (2005), but kernel 2.4 was an option
In emc-related distribution: BDI4 in 2005, Dapper in 2006

There are a few things that are complicated by kernel 2.4 support
(found by some quick greps; there may be more):
 * HAVE_CPU_KHZ (but we don't HAVE_CPU_KHZ for sim, so it has to stay)
 * ns2tsc_factor (parport reset-time must be clock cycles on 2.4 systems?)
 * NR_CPUS, cpu_online() (for running RT threads on a specific CPU)
 * module parameter declarations (these have to stay for sim too)
but in general there seem to be fewer items than for kernel 2.2.

Oh, and here are some other software versions of relevance, along with
release dates:
 * gettext 0.14.5, 2005 (optional, but must uninstall xgettext, msgfmt)
 * gtk 2.4.0, 2004 (optional.  for halscope, halmeter, classicladder)
 * python 2.4, 2004 (optional.  for axis; dunno about requirement for comp)
 * lyx 1.5, 2007 (optional, for building documentation)
 * git 1.5, 2007 (optional, for participating in development; maybe 1.4 is OK?)
while userspace is typically easier to upgrade than the kernel, this
gives a sense of the era of software that emc requires.

Jeff

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