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adapter/parport: Deprecate direct I/O support

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We deprecate direct I/O support in favor of ppdev for the following
reasons:

  - Linux supports ppdev since ~2.4 (released ~24 years ago) and it is
    enabled by default on major distros (Ubuntu, Fedora). So it is
    effectively ubiquitous
  - FreeBSD provides no direct I/O support, so ppdev (ppi) is the only
    viable option
  - Direct I/O requires root/elevated privileges which is inadvisable
  - Removing direct I/O reduces build and driver complexity and yields
    a smaller, easier-to-maintain codebase
  - Supporting only ppdev allows us to simplify the codebase by using
    device files (e.g., /dev/parport0) instead of numeric identifiers

Windows is the only rationale to keep direct I/O, but the user base
appears minimal to nonexistent and no active contributors can test the
Windows driver.

Change-Id: Ia6d5ed6e8c5faa2a9b4919ca97c5cf9033372a64
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9151
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
This commit is contained in:
Marc Schink
2025-08-17 14:11:39 +00:00
committed by Antonio Borneo
parent 6d51e6b900
commit 39ed0b0bba
3 changed files with 10 additions and 1 deletions
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2
src/jtag/drivers/parport.c
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@@ -341,6 +341,8 @@ static int parport_init(void)
#endif /* not __FreeBSD__, __FreeBSD_kernel__ */
#else /* not PARPORT_USE_PPDEV */
LOG_WARNING("DEPRECATED: Parallel port access with direct I/O is deprecated and support will be removed in the next release");
if (!parport_port) {
parport_port = 0x378;
LOG_WARNING("No parallel port specified, using default 0x378 (LPT1)");