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Lee Lup Yuen 2024-05-07 11:55:41 +08:00
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README.md
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@ -662,14 +662,57 @@ TODO: If we prefer to boot NuttX with MicroSD instead of TFTP, try this [MicroSD
# Set the NuttX Memory Map for SG2000
TODO
https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2
From above, we see that SG2000 boots at this address...
```bash
kernel_addr_r=0x80200000
```
Thus we define the NuttX Memory Map for SG2000 like so...
https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2
NuttX Kernel will boot at 0x8020_0000, NuttX Apps will run at Virtual Address 0xC000_0000.
Here's the NuttX Config: [boards/risc-v/bl808/ox64/configs/nsh/defconfig](https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2#diff-fa4b30efe1c5e19ba2fdd2216528406d85fa89bf3d2d0e5161794191c1566078)
```bash
## Kernel RAM
CONFIG_RAM_START=0x80200000
CONFIG_RAM_SIZE=1048576
## Kernel Paged Pool (Allocated to NuttX Apps)
CONFIG_ARCH_PGPOOL_PBASE=0x80600000
CONFIG_ARCH_PGPOOL_VBASE=0x80600000
CONFIG_ARCH_PGPOOL_SIZE=4194304
## Virtual Memory for NuttX App Code
CONFIG_ARCH_TEXT_VBASE=0xC0000000
CONFIG_ARCH_TEXT_NPAGES=128
## Virtual Memory for NuttX App Data
CONFIG_ARCH_DATA_VBASE=0xC0100000
CONFIG_ARCH_DATA_NPAGES=128
## Virtual Memory for NuttX App Heap
CONFIG_ARCH_HEAP_VBASE=0xC0200000
CONFIG_ARCH_HEAP_NPAGES=128
```
And here's the NuttX Linker Script: [boards/risc-v/bl808/ox64/scripts/ld.script](https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2#diff-769e7c2389b298f666c84b92f36d3c42fa852fda61dbf20b93e603df98b7bd37)
```c
MEMORY {
kflash (rx) : ORIGIN = 0x80200000, LENGTH = 2048K /* w/ cache */
ksram (rwx) : ORIGIN = 0x80400000, LENGTH = 2048K /* w/ cache */
pgram (rwx) : ORIGIN = 0x80600000, LENGTH = 4096K /* w/ cache */
ramdisk (rwx) : ORIGIN = 0x80A00000, LENGTH = 16M /* w/ cache */
}
...
SECTIONS {
. = 0x80200000;
```
# Disable the PLIC Interrupt Controller
TODO