1On platforms running AMI BMC firmware (Habanero and Firestone at the moment),
2the 'Get/Set' System Boot Options' command has been extended to allow overrides
3to the network configuration to be specified. In Petitboot this will cause any
4existing network configuration to be overridden by the specified configuration.
5The format of each IPMI request is similar to that of the usual boot options
6request, with a slightly different payload.
7
8The start of the request is similar to a usual boot option override, but
9specifies the fields of interest differently, ie;
10
11Specify 'chassis bootdev', field 96, data1 0x00 0x08 0x61 0x80
12
13The rest of request format is defined by Petitboot as: - 4 byte cookie value
14(always 0x21 0x70 0x62 0x21) - 2 byte version value (always 0x00 0x01) - 1 byte
15hardware address size (eg. 0x06 for MAC address) - 1 byte IP address size (eg.
160x04 for IPv4) - Hardware (MAC) address - 1 byte flags for 'ignore' and
17'method', where method = 0 is DHCP and method = 1 is Static. And for static
18configs: - IP Address - 1 byte subnet value - Gateway address
19
20Describing each field in more detail:
21
22Specify 'chassis bootdev', field 96, data1 0x00 0x08 0x61 0x80
23
24Set a special cookie that Petitboot will recognise: 0x21 0x70 0x62 0x21
25
26Specify the version (only 1 at the moment) 0x00 0x01
27
28Specify the size of the MAC address and IP address. This is used to
29differentiate between IPv4 and IPv6 addresses, or potential future support for
30Infiniband/etc. 0x06 0x04 (6-byte MAC address, IPv4 IP address)
31
32Set the hardware address of the interface you want to override, eg: 0xf4 0x52
330x14 0xf3 0x01 0xdf
34
35Specify 'ignore' or 'static/dynamic' flags. The second byte specifies to use
36either DHCP or static IP configuration (0 for DHCP). 0x00 0x01
37
38The below fields are required if setting a static configuration:
39
40Set the IP address you want to use, eg: 0x0a 0x3d 0xa1 0x42
41
42Set the subnet mask (short notation), eg '16': 0x10
43
44Set the gateway address, eg: 0x0a 0x3d 0x2 0x1
45
46All together this should look like: 0x00 0x08 0x61 0x80 0x21 0x70 0x62 0x21 0x00
470x01 0x06 0x04 0xf4 0x52 0x14 0xf3 0x01 0xdf 0x00 0x01 0x0a 0x3d 0xa1 0x42 0x10
480x0a 0x3d 0x2 0x1
49
50To clear a network override, it is sufficient to clear out the request, or set a
51zero-cookie which Petitboot will reject. Eg: 0x00 0x08 0x61 0x80 0x00 0x00 0x00
520x00
53
54You can 'Get' the override back with 0x00 0x09 0x61 0x80 0x00 which should
55return whatever is currently set.
56