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+On platforms running AMI BMC firmware (Habanero and Firestone at the moment),
+the 'Get/Set' System Boot Options' command has been extended to allow overrides
+to the network configuration to be specified.
+In Petitboot this will cause any existing network configuration to be overridden
+by the specified configuration. The format of each IPMI request is similar to
+that of the usual boot options request, with a slightly different payload.
+The start of the request is similar to a usual boot option override, but
+specifies the fields of interest differently, ie;
+Specify 'chassis bootdev', field 96, data1
+0x00 0x08 0x61 0x80
+The rest of request format is defined by Petitboot as:
+ - 4 byte cookie value (always 0x21 0x70 0x62 0x21)
+ - 2 byte version value (always 0x00 0x01)
+ - 1 byte hardware address size (eg. 0x06 for MAC address)
+ - 1 byte IP address size (eg. 0x04 for IPv4)
+ - Hardware (MAC) address
+ - 1 byte flags for 'ignore' and 'method', where method = 0 is DHCP
+ and method = 1 is Static.
+And for static configs:
+ - IP Address
+ - 1 byte subnet value
+ - Gateway address
+Describing each field in more detail:
+Specify 'chassis bootdev', field 96, data1
+0x00 0x08 0x61 0x80
+Set a special cookie that Petitboot will recognise:
+0x21 0x70 0x62 0x21
+Specify the version (only 1 at the moment)
+0x00 0x01
+Specify the size of the MAC address and IP address. This is used to
+differentiate between IPv4 and IPv6 addresses, or potential future support for
+0x06 0x04 (6-byte MAC address, IPv4 IP address)
+Set the hardware address of the interface you want to override, eg:
+0xf4 0x52 0x14 0xf3 0x01 0xdf
+Specify 'ignore' or 'static/dynamic' flags. The second byte specifies to use
+either DHCP or static IP configuration (0 for DHCP).
+0x00 0x01
+The below fields are required if setting a static configuration:
+Set the IP address you want to use, eg:
+0x0a 0x3d 0xa1 0x42
+Set the subnet mask (short notation), eg '16':
+Set the gateway address, eg:
+0x0a 0x3d 0x2 0x1
+All together this should look like:
+0x00 0x08 0x61 0x80 0x21 0x70 0x62 0x21
+0x00 0x01 0x06 0x04 0xf4 0x52 0x14 0xf3
+0x01 0xdf 0x00 0x01 0x0a 0x3d 0xa1 0x42
+0x10 0x0a 0x3d 0x2 0x1
+To clear a network override, it is sufficient to clear out the request, or set
+a zero-cookie which Petitboot will reject. Eg:
+0x00 0x08 0x61 0x80 0x00 0x00 0x00 0x00
+You can 'Get' the override back with
+0x00 0x09 0x61 0x80 0x00
+which should return whatever is currently set.
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