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Lee Lup Yuen 2023-06-26 18:39:13 +08:00
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@ -66,6 +66,10 @@ kernel_addr_r=0x44000000
This probably means that U-Boot Bootloader is loaded at `0x4000` `0000`.
U-Boot Bootloader loads the Linux Kernel from `armbi_root/boot/Image`
Which is sym-linked to `armbi_root/boot/vmlinuz-5.15.0-starfive2`
Here are the files in `armbi_root/boot`...
```text
@ -100,9 +104,9 @@ Write the .img to a microSD Card with Balena Etcher. Insert the microSD Card int
We see 4 used partitions...
- spl (2 MB): ???
- spl (2 MB): [Secondary Program Loader](https://github.com/u-boot/u-boot)
- uboot (4 MB): U-Boot Bootloader
- uboot (4 MB): [U-Boot Bootloader](https://u-boot.readthedocs.io/en/latest/index.html)
- boot (380 MB): Boot Configuration for U-Boot
@ -167,6 +171,8 @@ kernel_addr_r=0x40200000
(Different from Armbian: `0x4400` `0000`)
So Yocto boots from the [Flat Image Tree (FIT)](https://u-boot.readthedocs.io/en/latest/usage/fit/index.html#): `boot/fitImage`
Yocto's `root/boot` looks different from Armbian...
```text
@ -177,8 +183,14 @@ lrwxrwxrwx 1 root root 17 Mar 9 2018 fitImage -> fitImage-5.15.107
-rw-r--r-- 1 root root 15151064 Mar 9 2018 fitImage-initramfs-5.15.107
```
TODO: Yocto boots from FIT File `boot/fitImage`? Is this a Linux Flat Image?
# Boot NuttX with U-Boot Bootloader
TODO: Boot NuttX with Armbian or Yocto settings? `0x4400` `0000` or `0x4020` `0000`?
_Will we boot NuttX with Armbian or Yocto settings? `0x4400` `0000` or `0x4020` `0000`?_
Armbian looks simpler, since it uses a plain Linux Kernel Image File `Image`. (Instead of Yocto's complicated Flat Image Tree)
Hence we will overwrite Armbian's `armbi_root/boot/Image` by the NuttX Kernel Image.
TODO: What's inside `armbi_root/boot/Image`?
# TODO