3.3 KiB
NOTE: if running flashprog -p internal for software based flashing, and you
get an error related to /dev/mem access, you should reboot with
iomem=relaxed kernel parameter before running flashprog, or use a kernel that
has CONFIG_STRICT_DEVMEM not enabled.
On NetBSD and OpenBSD systems, the equivalent to iomem=relaxed in this case
is kernel.securelevel=-1; see NetBSD securelevel
manual
and OpenBSD securelevel manual.
ERROR: Could not get I/O privileges
Error message: ERROR: Could not get I/O privileges (Function not implemented)
If you get this while running flashprog -p internal -w filename.rom (or any
internal flash operation), note: flashprog heavily uses ioperm/iopl functions
to operate the internal flasher, at least on x86 machines.
See: https://lwn.net/Articles/804143/
Yeah, just enable CONFIG_X86_IOPL_IOPERM in your Linux kernel. This is
a build-time option, so you must re-compile your kernel, or find a build that
has this option enabled (IOPL emulation). Many default kernel configurations
now disable this option.
Here's a handy-dandy guide for building a kernel from source: https://www.cyberciti.biz/tips/compiling-linux-kernel-26.html
BSD users: On OpenBSD and NetBSD if you get similar errors, note that it
should work here, but you need to boot with kern.securelevel=-1.
See: NetBSD securelevel manual
and OpenBSD securelevel manpage.
Otherwise, if you get such errors, it may just be that you're not root. You must run flashprog as root, at least to use the internal flasher (using external USB flashing dongles doesn't normally require root).
NOTE: BSD kernels seem to still enable IOPL by default. However, many modern Linux setups disable it by default these days, so it may be in teh future that most users will start needing to compile their own kernels. (go BSD!)