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Replacing the CenturyLink provided ethernet router with OpenBSD
Unfortunately CenturyLink provisions their fiber to the home
with a PPPoE authentication over vlan 201, this makes replacing
the router more difficult than it should be. I also had to call
CenturyLink support to get the password for the PPPoE connection.
cnmac0 is the egress interface on my EdgeRouter Lite.
What is so special about the x60 when running vendor bios?
Vendor BIOS write protects its bootblock, which means the lowest 64K of the flash can't be modified
This is a problem since the first code that runs on the CPU comes from there and if we
ever want to run coreboot the cpu must start with coreboot code.
This write protection is set in the PBR (protect bios range) registers on the southbridge, there is currently no known way to change them back once they are locked by setting the SPI Configuration Lock-Down bit.
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# To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.
# You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
What is the Strict Aliasing Rule and Why do we care?
(OR Type Punning, Undefined Behavior and Alignment, Oh My!)
What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.
In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.
Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th
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