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Lee Lup Yuen 2024-05-07 13:28:04 +08:00
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README.md
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@ -715,15 +715,19 @@ SECTIONS {
# Disable the PLIC Interrupt Controller
TODO
https://github.com/lupyuen2/wip-nuttx/commit/6d66caa1408d7a7d7b21b0e876ce32ceb5b93ec4
No PLIC? From [SG2000 Reference Manual](https://github.com/sophgo/sophgo-doc/releases)
Most RISC-V SBCs (Ox64, Star64) will manage Interrupts with a Platform-Level Interrupt Controller (PLIC). But SG2000 uses an 8051 Interrupt Controller? From [SG2000 Reference Manual](https://github.com/sophgo/sophgo-doc/releases)
> __14.3.3 Interrupt Handling:__ 8051 can receive external level-triggered interrupts through the int0_n and int1_n interfaces. int0_n/int1_n selects to
output interrupt signals to 8051 from ictl (interrupt control) and configuration register reg_51_int1_src_mask respectively
So let's disable PLIC in NuttX...
https://github.com/lupyuen2/wip-nuttx/commit/6d66caa1408d7a7d7b21b0e876ce32ceb5b93ec4
TODO: How to handle interrupts with 8051?
TODO: Dump the SG2000 Linux Device Tree to understand the 8051 Interrupt Controller
# Select the NuttX Driver for 16550 UART
TODO