git: Comparing Multiple Branches
Wanting to compare multiple branches in git? Give this a shot: git log --color --graph --topo-order --oneline origin/master origin/branch1 origin/branch2
git aliases: svn revert
People converting from svn to git often have a hard time finding an analogous process for their svn commands. For something similar to svn revert, you need to do the following: git clean -df git checkout -- . The first command will remove newly created files that have not yet been staged for commit. The second …
Tip: Getting Your Linux Kernel Source
If you're ever using a Linux environment and need the source for your kernel version, simply use apt-get and run the following: apt-get source linux-image-$(uname -r) This command will download the kernel source into the current directory. The apt-get source command will work to get the source for any binary package when available.
WFI and JTAG
JTAG and wfi do not place nicely together. You've probably noticed this yourself, wondering why JTAG can't connect or a halt/breakpoint doesn't work. When the ARM core is executing the wait for interrupt operation, the core is placed into a low power mode and the core clock is gated. This wreaks havoc with JTAG, as …
git cherry-pick recommendations
If you’re planning to cherry-pick commits between branches, I recommend that you always use the -xflag when cherry picking: ""Quote -x When recording the commit, append a line that says “(cherry picked from commit …)”to the original commit message in order to indicate which commit this change was cherry-picked from. This is done only for cherry …
ARM Interrupt Vector Addresses
I frequently need to look up the ARM interrupt address vectors when debugging. Here's a handy table for a quick reference.
cdecl
If you ever have trouble remembering how to declare things in C (like those pesky function pointers), try out cdecl: brew install cdecl apt install cdecl Simply specify in English what you want to declare, and cdecl will show you the way: declare memcpy as volatile pointer to function(int) returning void void (* volatile memcpy)(int …
Debugging Strategy: Finding Version from a Memory Dump
Have you ever had a device that's in a weird state, and you're curious what version of software is on it so you can load the correct debug symbols? Here's a strategy for figuring that out: Connect to device over JTAG when it's in the desired state Use your JTAG tool to dump the contents …
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Shipping Mindset
I keep a compilation of book notes and try to review them to keep the books and lessons fresh in my mind. I came across a few Steven Pressfield quotes regarding "shipping". This mindset is important when building embedded systems - if you don't ship, you have built nothing. Why does Seth Godin place so …
cscope
When you're working on a large software project, it's extremely difficult to keep all the bits and pieces in your head. cscope is designed to help eliminate all your needless searching through files, enabling you to quickly search for: all references to a symbol global definitions functions called by a function functions calling a function …