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@ -279,50 +279,123 @@ Here's another Linux Image: https://github.com/logicethos/Milk-V_Duo_Linux2SD
# Boot Milk-V Duo S over TFTP
Here are the steps to boot Milk-V Duo S over TFTP...
We'll port NuttX by booting over TFTP, but let's test TFTP first. Here are the steps to boot Milk-V Duo S over TFTP...
https://lupyuen.github.io/articles/tftp#configure-u-boot-for-tftp
```bash
## U-Boot tftpserver
## Set U-Boot TFTP Server
setenv tftp_server 192.168.31.10
printenv tftp_server
saveenv
## Set RAM Disk Size (assume the max)
setenv ramdisk_size 0x1000000
printenv ramdisk_size
## TODO: saveenv doesn't exist, can't save Environment Variables!
## TODO: Update the Boot Config in MicroSD instead
## saveenv
## Fetch the IP Address over DHCP
## Load the NuttX Image from TFTP Server
## kernel_addr_r=0x40200000
## kernel_addr_r=0x80200000
## tftp_server=192.168.x.x
if tftpboot ${kernel_addr_r} ${tftp_server}:Image;
then
## TODO: Fix the NuttX Image
dhcp ${kernel_addr_r} ${tftp_server}:Image
## Load the Device Tree from TFTP Server
## fdt_addr_r=0x46000000
if tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb;
then
## Load the Device Tree from TFTP Server
## fdt_addr_r=0x81200000
## TODO: Fix the Device Tree
tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb
## Set the RAM Address of Device Tree
## fdt_addr_r=0x46000000
if fdt addr ${fdt_addr_r};
then
## Set the RAM Address of Device Tree
## fdt_addr_r=0x81200000
fdt addr ${fdt_addr_r}
## Load the Intial RAM Disk from TFTP Server
## ramdisk_addr_r=0x46100000
if tftpboot ${ramdisk_addr_r} ${tftp_server}:initrd;
then
## Load the Intial RAM Disk from TFTP Server
## ramdisk_addr_r=0x81600000
## TODO: Fix the Initial RAM Disk
tftpboot ${ramdisk_addr_r} ${tftp_server}:initrd
## Boot the NuttX Image with the Initial RAM Disk and Device Tree
## kernel_addr_r=0x40200000
## ramdisk_addr_r=0x46100000
## ramdisk_size=0x1000000
## fdt_addr_r=0x46000000
booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r};
fi;
fi;
fi;
fi
## Boot the NuttX Image with the Initial RAM Disk and Device Tree
## kernel_addr_r=0x80200000
## ramdisk_addr_r=0x81600000
## ramdisk_size=0x1000000
## fdt_addr_r=0x81200000
booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r}
```
TODO: What happens?
_What happens when we run this?_
```bash
cv181x_c906# setenv tftp_server 192.168.31.10
cv181x_c906# printenv tftp_server
tftp_server=192.168.31.10
cv181x_c906# setenv ramdisk_size 0x1000000
cv181x_c906# printenv ramdisk_size
ramdisk_size=0x1000000
cv181x_c906# dhcp ${kernel_addr_r} ${tftp_server}:Image
Speed: 100, full duplex
BOOTP broadcast 1
BOOTP broadcast 2
*** Unhandled DHCP Option in OFFER/ACK: 43
*** Unhandled DHCP Option in OFFER/ACK: 43
DHCP client bound to address 192.168.31.47 (550 ms)
Using ethernet@4070000 device
TFTP from server 192.168.31.10; our IP address is 192.168.31.47
Filename 'Image'.
Load address: 0x80200000
Loading: #################################################################
. #################################################################
. #############
. 1.2 MiB/s
done
Bytes transferred = 2097800 (200288 hex)
cv181x_c906# tftpboot ${fdt_addr_r} ${tftp_server}:jh7110-star64-pine64.dtb
Speed: 100, full duplex
Using ethernet@4070000 device
TFTP from server 192.168.31.10; our IP address is 192.168.31.47
Filename 'jh7110-star64-pine64.dtb'.
Load address: 0x81200000
Loading: ####
. 1.1 MiB/s
done
Bytes transferred = 50235 (c43b hex)
cv181x_c906# fdt addr ${fdt_addr_r}
cv181x_c906# 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)
cv181x_c906# booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r}
## Flattened Device Tree blob at 81200000
Booting using the fdt blob at 0x81200000
Loading Ramdisk to 9e27f000, end 9f27f000 ... OK
Loading Device Tree to 000000009e26f000, end 000000009e27e43a ... OK
Starting kernel ...
```
NuttX Kernel hangs, but that's OK! We haven't modified NuttX Kernel for SG2000 yet. Let's fix this...
# Boot Apache NuttX RTOS over TFTP