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Lee Lup Yuen 2023-11-26 07:57:36 +08:00
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@ -4,6 +4,8 @@
Read the articles...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
- ["RISC-V Ox64 BL808 SBC: Sv39 Memory Management Unit"](https://lupyuen.github.io/articles/mmu)
- ["RISC-V Ox64 BL808 SBC: Starting Apache NuttX RTOS"](https://lupyuen.github.io/articles/ox2)
@ -1607,6 +1609,10 @@ TODO: Enable UART Interrupts
# Initial RAM Disk for Ox64 BL808
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
Two ways we can load the Initial RAM Disk...
1. Load the Initial RAM Disk from a __Separate File: initrd__ (similar to Star64)
@ -2498,6 +2504,10 @@ TODO: [SATP Log](https://gist.github.com/lupyuen/aa9b3e575ba4e0c233ab02c32822152
# Start NuttX Apps on Ox64 BL808
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
NuttX Kernel starts a NuttX App (in ELF Format) by calling...
- [__ELF Loader: g_elfbinfmt__](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ox64b/binfmt/elf.c#L84-L94), which calls...
@ -2546,6 +2556,10 @@ Right after that, [__nx_bringup__](https://github.com/apache/nuttx/blob/master/s
# Simple NuttX App for Ox64 BL808
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
_What's inside the simplest app for NuttX?_
From [hello_main.c](https://github.com/lupyuen2/wip-pinephone-nuttx-apps/blob/ox64b/examples/hello/hello_main.c#L36-L40)
@ -2646,6 +2660,10 @@ Then `printf` will appear in our disassembly.
![NuttX App calls NuttX Kernel](https://lupyuen.github.io/images/app-syscall.jpg)
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
_How does a NuttX App make a System Call to NuttX Kernel?_
Our NuttX App calls `write`, which is a Proxy Version...
@ -2756,6 +2774,10 @@ PROXY_waitpid.c
# Kernel Handles App Call
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
_Our App makes an ecall to jump to NuttX Kernel..._
_What happens on the other side?_
@ -2948,6 +2970,10 @@ create_region --> mmu_ln_setentry["Set MMU Page Table Entry: \n mmu_ln_setentry
click mmu_ln_setentry href "https://github.com/apache/nuttx/blob/master/arch/risc-v/src/common/riscv_mmu.c#L62-L109" "arch/risc-v/src/common/riscv_mmu.c" _blank
```
Read the article...
- ["RISC-V Ox64 BL808 SBC: NuttX Apps and Initial RAM Disk"](https://lupyuen.github.io/articles/app)
_Phew so NuttX Apps can call NuttX Kernel..._
_But how does NuttX Kernel start a NuttX App?_