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Initial RAM Disk

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Lee Lup Yuen 2023-07-21 10:12:56 +08:00
parent a03cf91cc6
commit 9e4df4dc7a
1 changed files with 19 additions and 11 deletions
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@ -2923,13 +2923,17 @@ Note that `__pgheap_size` needs to include `ramdisk`.
Let's do the same to NuttX for QEMU...
# Add Initial RAM Disk to NuttX QEMU
# Modify NuttX QEMU to Load Initial RAM Disk
TODO
Now we can modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk instead of Semihosting. (So later we can replicate this on Star64)
Now we can modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk instead of Semihosting.
Build NuttX QEMU in Kernel Mode: [Build Steps](https://github.com/lupyuen2/wip-pinephone-nuttx/tree/master/boards/risc-v/qemu-rv/rv-virt)
(So later we can replicate this on Star64)
We follow the steps from LiteX Arty-A7...
We build NuttX QEMU in Kernel Mode: [Build Steps](https://github.com/lupyuen2/wip-pinephone-nuttx/tree/master/boards/risc-v/qemu-rv/rv-virt)
```bash
## Build NuttX QEMU Kernel Mode
@ -2944,7 +2948,7 @@ make import V=1
popd
```
TODO: To generate Initial RAM Disk...
To generate the Initial RAM Disk `initrd`...
```bash
cd nuttx
@ -2967,7 +2971,15 @@ qemu-system-riscv64 \
-nographic
```
[(See the Modified Files)](https://github.com/lupyuen2/wip-pinephone-nuttx/pull/33)
_What is the RAM Address of the Initial RAM Disk in QEMU?_
Initial RAM Disk is loaded by QEMU at `0x8400` `0000`...
- ["RAM Disk Address for RISC-V QEMU"](https://github.com/lupyuen/nuttx-star64#ram-disk-address-for-risc-v-qemu)
Below are the files that we changed in NuttX for QEMU to load the Initial RAM Disk (instead of Semihosting)...
- [Modified Files for QEMU with Initial RAM Disk](https://github.com/lupyuen2/wip-pinephone-nuttx/pull/33/files)
We configured QEMU to mount the RAM Disk as ROMFS (instead of Semihosting): [knsh64/defconfig](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk/boards/risc-v/qemu-rv/rv-virt/configs/knsh64/defconfig)
@ -3062,7 +3074,7 @@ void qemu_rv_kernel_mappings(void) {
memcpy((void *)__ramdisk_start, (void *)0x84000000, (size_t)__ramdisk_size);
```
Here's the log...
Before making the above changes, here's the log for QEMU with Semihosting...
```text
+ genromfs -f initrd -d ../apps/bin -V NuttXBootVol
@ -3089,11 +3101,7 @@ NuttShell (NSH) NuttX-12.0.3
nsh> nx_start: CPU0: Beginning Idle Loop
```
_What is the RAM Address of the Initial RAM Disk in QEMU?_
Initial RAM Disk is loaded by QEMU at `0x8400` `0000`...
- ["RAM Disk Address for RISC-V QEMU"](https://github.com/lupyuen/nuttx-star64#ram-disk-address-for-risc-v-qemu)
Now we run it with Initial RAM Disk, without Semihosting...
# Load Address Misaligned in NuttX ROMFS