Difference between revisions of "User:Bweither"

Latest revision as of 16:51, 31 July 2018

Weekly Log

Week 1

• Orientation
• Met other REU students
• Familiarized with Git versions of Research Xinu

Week 2

• Worked with Rade Latinovich to become familiar with Research Xinu
• Initialized all cores to nullprocess
• Struggling with multicore resched
• All printing after shell established breaks shell, can this change?

Week 3

• Disabled shell to enable Kprintf
• Turned off single core clock
• Scheduled processes on all 4 cores without timer/preemption
• Shared ready list
• Locked ready list with Mutex

Week 4

• Tried to find documentation for BCM 2837 Chip
• Only able to find documentation for BCM 2835
• Decided to use Local Timer clock to generate interrupts

Week 5

• Set up Local Timer, enabling timer
• Unmasked Local Timer IRQ on routing side
• Enabling IRQ from Local Timer crashes program
• What is LT IRQ number on ARM side?

Week 6

• Poured through ARM A53 documentation to try to find IRQ num for Local Timer
• Looked over ARM vA7 documentation to understand IRQ protocols
• Unable to find handling protocol for Local Timer

Week 7

• Decided to use different timer from Local Timer
• Doesn't seem to have any supporting hardware documentation
• Leaves two options: core-specific timers and SoC clock

Week 8

• Found GPU routing register in BCM 2835 documentation
• Allows me to route interrupts from previously working SoC clock to any core
• Set up basic round-robin scheduler from SoC clock
• Unable to handle Interrupts on different cores

Week 9

• Found VBAR in ARM documentation, big thanks to Ben
• Able to handle IRQ's on non-0 cores now
• Preemptive round-robin scheduler working across all cores
• Made poster for poster presentation day

Week 10

• Gave poster presentation
• Worked on writing final paper
• Developed final presentation
• Gave final presentation