78 lines
4.5 KiB
Plaintext
78 lines
4.5 KiB
Plaintext
[video member=miotatsu stream_platform=twitch project=riscy title="Studying CLINT" vod_platform=youtube id=xtW4-ouxQQY annotator=Miblo]
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[0:10][A few words on the webcam position and a tease of some exciting content in the pipeline]
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[1:28][Recap and consult the SiFive forum reply[ref
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site="SiFive forums"
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page="Question about disabling interrupts in the demo_gpio program"
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url=https://forums.sifive.com/t/question-about-disabling-interrupts-in-the-demo-gpio-program/397] regarding the clear_csr() calls in demo_gpio.c]
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[5:10][A few words on updating the Freedom E SDK to commit 3a01ac1]
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[7:08][Look at the Makefile for demo_gpio.c, and the updated demo_gpio.c itself]
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[9:11][Consult the commit diffs for the Freedom E SDK[ref
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site=GitHub
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page="sifive / freedom-e-sdk"
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url=https://github.com/sifive/freedom-e-sdk]]
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[17:25][Shout-out to Megan Wachs]
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[18:02][Continue consulting the commit diffs[ref
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site=GitHub
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page="sifive / freedom-e-sdk"
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url=https://github.com/sifive/freedom-e-sdk]]
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[19:04][Return to looking at reset_demo()][:research]
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[21:34][Read about the machine-mode software interrupts (MSIP) of the CLINT[ref
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site="SiFive Developers"
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page="E3 Coreplex Manual"
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url=https://static.dev.sifive.com/pdfjs/web/viewer.html?file=https://static.dev.sifive.com/SiFive-E3-Coreplex-v1.2.pdf]][:hardware :research]
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[24:51][Read about the Machine Timer Registers in the Privileged ISA Specification[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:hardware :research]
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[27:48][Read about the Timer Registers and consult the CLINT memory map[ref
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site="SiFive Developers"
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page="E3 Coreplex Manual"
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url=https://static.dev.sifive.com/pdfjs/web/viewer.html?file=https://static.dev.sifive.com/SiFive-E3-Coreplex-v1.2.pdf]][:hardware :research]
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[31:05][Read about Memory Privilege in mstatus Register[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:hardware :research]
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[34:00][Hunt for some documentation on the CLINT in the Platform Reference Manual, and read the Introduction[ref
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site="SiFive Developers"
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page="Platform Reference Manual"
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url=https://www.sifive.com/documentation/freedom-soc/freedom-e300-platform-reference-manual/]][:research]
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[38:02][Note that the E300 SoC is optimized for manufacture in a TSMC 180nm process, and again recommend "Indistinguishable From Magic: Manufacturing Modern Computer Chips"[ref
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site=YouTube
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page="Indistinguishable From Magic: Manufacturing Modern Computer Chips"
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url=https://www.youtube.com/watch?v=NGFhc8R_uO4]][:fabrication]
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[38:57][Hunt for more documentation on the CLINT[ref
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site="SiFive Developers"
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page="Platform Reference Manual"
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url=https://www.sifive.com/documentation/freedom-soc/freedom-e300-platform-reference-manual/]][:research]
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[46:29][Read about mip and mie again[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:hardware :research]
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[49:48][Read about Local Interrupt Sources[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:hardware :research]
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[51:32][Consult the machine-mode status register table[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]][:hardware :research]
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[54:36][Begin to understand how demo_gpio.c is setting the machine timers in conjunction with the CLINT Memory Map[ref
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site="RISC-V"
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page="Draft Privileged ISA Specification v1.9.1"
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url=https://riscv.org/specifications/privileged-isa/]]
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[56:58][:Research CLINT_MTIMECMP][:hardware]
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[1:02:08][Note that we're hardcoding that we're on hart 0][:hardware :research]
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[1:03:21][Review how plic_driver.c commonly computes the correct memory locations][:hardware :research]
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[1:05:26][A few words on code brittleness and :optimisation]
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[1:07:15][Mention that the Freedom E SDK failed to compile, as also mentioned in the SiFive Forums[ref
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site="SiFive Forums"
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page="Arch Linux and the HiFive1"
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url=https://forums.sifive.com/t/arch-linux-and-the-hifive1/212]]
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[1:08:13][Shout-out to nonerkao]
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[1:10:01][That's everything for today, with a mention of the twitter schedule[ref
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site=Twitter
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page="RISCY BUSINESS"
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url=https://twitter.com/hmn_riscy]]
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[1:11:29][Shout-out to @hossein1387]
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[/video]
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