[U-Boot] [PATCH] Adds basic support for ProxyDHCP

[Tom Rini]

On Mon, Aug 05, 2019 at 06:23:42AM -0400, lylejfranklin at gmail.com wrote:

> From: Lyle Franklin <lylejfranklin at gmail.com>
> 
> - ProxyDHCP allows a second DHCP server to exist alongside your main
>   DHCP server and supply additional BOOTP related options
> - When u-boot sends out a DHCP request, the real DHCP server will
>   respond with a normal response containing the new client IP address
>   while simultaneously the ProxyDHCP server will respond with a blank
>   client IP address and a `bootfile` option
> - This patch adds CONFIG_SERVERIP_FROM_PROXYDHCP (default false) to
>   enable this behavior and CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS
>   (default 100) which tells u-boot to wait additional time after
>   receiving the main DHCP response to give the ProxyDHCP response time
>   to arrive
> - The PXE spec for ProxyDHCP is more complicated than the solution
>   added here as diagramed on page 16:
>   http://www.pix.net/software/pxeboot/archive/pxespec.pdf:
> 
> ```
> DHCP Discover will be retried four times. The four timeouts are 4, 8, 16
> and 32 seconds respectively. If a DHCPOFFER is received without an Option
> timeouts in an attempt to receive a PXE response.
> ```
> 
> - Adding a simple delay worked for my purposes but let me know if a
>   more robust solution is required
> 
> Signed-off-by: Lyle Franklin <lylejfranklin at gmail.com>

Sorry for the delay, applied to u-boot/next, thanks!

-- 
Tom
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