lupyuen/nuttx-sg2000
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Lee Lup Yuen 2024-05-08 16:36:03 +08:00
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README.md
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@ -284,49 +284,90 @@ We'll port NuttX by booting over TFTP, but let's test TFTP first. Here are the s
https://lupyuen.github.io/articles/tftp#configure-u-boot-for-tftp
```bash
## Set U-Boot TFTP Server
## Set the U-Boot TFTP Server
setenv tftp_server 192.168.31.10
printenv tftp_server
## Set RAM Disk Size (assume the max)
setenv ramdisk_size 0x1000000
printenv ramdisk_size
## If Initial RAM Disk is needed (like for Linux)...
## Set the RAM Disk Size (assume the max)
## setenv ramdisk_size 0x1000000
## printenv ramdisk_size
## Update the Boot Config in MicroSD instead
## Save the U-Boot Config for future reboots
saveenv
```
We load the NuttX Image over TFTP...
```bash
## Fetch the IP Address over DHCP
## Load the NuttX Image from TFTP Server
## kernel_addr_r=0x80200000
## tftp_server=192.168.x.x
## TODO: Fix the NuttX Image
dhcp ${kernel_addr_r} ${tftp_server}:Image-sg2000
## Load the Device Tree from TFTP Server
## fdt_addr_r=0x81200000
## TODO: Fix the Device Tree
## TODO: Fix the Device Tree, it's not needed by NuttX
tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb
## Set the RAM Address of Device Tree
## fdt_addr_r=0x81200000
## TODO: Fix the Device Tree, it's not needed by NuttX
fdt addr ${fdt_addr_r}
## TODO: If Initial RAM Disk is needed...
## If Initial RAM Disk is needed...
## Load the Intial RAM Disk from TFTP Server
## ramdisk_addr_r=0x81600000
## tftpboot ${ramdisk_addr_r} ${tftp_server}:initrd
## Boot the NuttX Image with the Initial RAM Disk and Device Tree
## Boot the NuttX Image with the Device Tree
## kernel_addr_r=0x80200000
## ramdisk_addr_r=0x81600000
## ramdisk_size=0x1000000
## fdt_addr_r=0x81200000
## TODO: Fix the Device Tree, it's not needed by NuttX
booti ${kernel_addr_r} - ${fdt_addr_r}
## For Linux: We need the RAM Disk Address
## ramdisk_addr_r=0x81600000
## ramdisk_size=0x1000000
## booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r}
```
Which becomes this, mashed up in a single line...
```bash
## Boot NuttX Image over TFTP
dhcp ${kernel_addr_r} ${tftp_server}:Image-sg2000 ; tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb ; fdt addr ${fdt_addr_r} ; booti ${kernel_addr_r} - ${fdt_addr_r}
```
Now we automate the TFTP Booting for future reboots...
```bash
## Add the Boot Command for TFTP
setenv bootcmd_tftp 'dhcp ${kernel_addr_r} ${tftp_server}:Image-sg2000 ; tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb ; fdt addr ${fdt_addr_r} ; booti ${kernel_addr_r} - ${fdt_addr_r}'
## Check that it's correct
printenv bootcmd_tftp
## Save it for future reboots
saveenv
## Test the Boot Command for TFTP, then reboot
run bootcmd_tftp
## Remember the Original Boot Targets
setenv orig_boot_targets "$boot_targets"
## Should show `mmc0 dhcp`
printenv boot_targets
## Save it for future reboots
saveenv
## Add TFTP to the Boot Targets
setenv boot_targets "$boot_targets tftp"
## Should show `mmc0 dhcp tftp`
printenv boot_targets
## Save it for future reboots
saveenv
```
_What happens when we run it at the U-Boot Command Prompt?_
This happens...
@ -369,17 +410,6 @@ Bytes transferred = 50235 (c43b hex)
$ fdt addr ${fdt_addr_r}
$ tftpboot ${ramdisk_addr_r} ${tftp_server}:initrd
Speed: 100, full duplex
Using ethernet@4070000 device
TFTP from server 192.168.31.10; our IP address is 192.168.31.47
Filename 'initrd'.
Load address: 0x81600000
Loading: #################################################################
. 1.2 MiB/s
done
Bytes transferred = 8354816 (7f7c00 hex)
$ booti ${kernel_addr_r} - ${fdt_addr_r}
## Flattened Device Tree blob at 81200000
Booting using the fdt blob at 0x81200000
@ -632,12 +662,6 @@ $ booti ${kernel_addr_r} - ${fdt_addr_r}
## booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r}
```
Or in a single line...
```bash
setenv tftp_server 192.168.31.10 ; dhcp ${kernel_addr_r} ${tftp_server}:Image-sg2000 ; tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb ; fdt addr ${fdt_addr_r} ; $ booti ${kernel_addr_r} - ${fdt_addr_r}
```
NuttX boots a tiny bit, and prints `123` yay!
```bash