Re: [LinuxBIOS] more big range for HT_CHAIN_UNITID_BASE and HT_CHAIN_UNITID_BASE

[Stefan Reinauer]

Lu, Yinghai wrote:
> More range for HT_CHAIN_UNITID_BASE and HT_CHAIN_END_UNITID_BASE.
> For example: in C51/MCP55 or C51/MCP51
> Will allow
> C51 at 0x10 to 0x14, and MCP at 0 to 4
> C51 at 1 to 4, and MCP at 7 to 0x0a

What? Why? How?
> The reason is c51/mcp51/mcp55 reported unitid is 0x0f (far beyond it
> needed), and will prevent us from putting them on bus 0.

Is this a chipset bug?
> Typical values for c51/mcp55 or c51/mcp51:
> HT_CHAIN_UNITID_BASE = 0x10 # for C51
> HT_CHAIN_END_UNITID_BASE = 0 # for mcp
>
> If only have mcp with c51, 
> HT_CHAIN_UNITID_BASE = 0 # for MCP
> #HT_CHAIN_END_UNITID_BASE = 0 # default value 0x20

Can we get this properly documented in the code somewhere?
The HT_CHAIN_ stuff is not exactly easy to understand.