While I agree this would be a useful feature, I don't believe it's
required to achieve what you want to achieve. U-Boot's pxe already
supports a way to point different client classes at different areas of
the tftp server.
U-boot doesn't need to download 'pxelinux.0' from the tftp server like
normal PXE implementations do, but it still respects the bootfile option
in dhcp responses. When you run 'dhcp' in U-boot it will attempt to
download whatever was supplied as the bootfile in the dhcp response, and
will set the 'bootfile' env variable accordingly.
Following the same convention as pxelinux, U-Boot's 'pxe get' will look
for config/image files at paths relative to the directory the 'bootfile'
location was given as.
So, given this dhcp config, highbank clients will be pointed at
/arm/highbank, and x86 PXE clients will be pointed at /x86/
class "pxe" {
match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
}
class "uboot-highbank" {
match if substring (option vendor-class-identifier, 0, 21) =
"U-boot.armv7.highbank";
}
subnet 192.168.100.0 netmask 255.255.255.0 {
server-name "192.168.100.1";
option tftp-server-name "192.168.100.1";
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.100.255;
option domain-name-servers 8.8.4.4;
option routers 192.168.100.254;
pool {
range 192.168.100.100 192.168.100.149;
allow members of "uboot-highbank";
filename "/arm/highbank/empty";
}
pool {
range 192.168.100.150 192.168.100.199;
allow members of "pxe";
filename "/x86/pxelinux.0";
}
}
The 'empty' file can be empty; as long as it exists, U-Boot will be
happy with the tftp request.
Here's some example output from highbank doing PXE:
Highbank #dhcp
BOOTP broadcast 1
*** Unhandled DHCP Option in OFFER/ACK: 28
*** Unhandled DHCP Option in OFFER/ACK: 28
DHCP client bound to address 192.168.100.100
Using xgmac0 device
TFTP from server 192.168.100.1; our IP address is 192.168.100.100
Filename '/arm/highbank/empty'.
Load address: 0x700000
Loading: #
done
Highbank #pxe get
missing environment variable: pxeuuid
Retrieving file: /arm/highbank/pxelinux.cfg/01-52-54-00-12-34-56
Using xgmac0 device
TFTP from server 192.168.100.1; our IP address is 192.168.100.100
Filename '/arm/highbank/pxelinux.cfg/01-52-54-00-12-34-56'.
Load address: 0x700000
Loading: *
TFTP error: 'File not found' (1)
Not retrying...
Retrieving file: /arm/highbank/pxelinux.cfg/C0A86464
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https://bugs.launchpad.net/bugs/927781
Title:
PXELINUX implementation doesn't respect dhcp ConfigFile or PathPrefix
values
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https://bugs.launchpad.net/u-boot-linaro/+bug/927781/+subscriptions
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