If you have smbus hub,

You may need to use

smbus_send_byte(hub_address, hub_channel);

or

smbus_write_byte(hub_address, hub_channel);

the code is same as CK804’s, and the code is verified with Tyan S4881 and 4885.

For PCA9556/PCA9516

static inline void activate_spd_rom(const struct mem_controller *ctrl)

{

#define SMBUS_HUB 0x18

            unsigned device=(ctrl->channel0[0])>>8;

            smbus_write_byte(SMBUS_HUB, 0x01, device);

            smbus_write_byte(SMBUS_HUB,0x03, 0);

}

YH

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From: linuxbios-bounces@linuxbios.org [mailto:linuxbios-bounces@linuxbios.org] On Behalf Of bxshi
Sent: Monday, January 22, 2007 11:04 PM
To: yinghailu@gmail.com
Cc: linuxbios@linuxbios.org
Subject: Re: [LinuxBIOS] MCP55 LinuxBIOS with USB debug

Dr. Lu,

In mcp55_smbus.h

static int do_smbus_send_byte(unsigned smbus_io_base, unsigned device, unsigned char val)
{

    .....

       outb(0, smbus_io_base + SMBHSTCMD);

    .....

}

I wonder why you write 0 to SMBHSTCMD ?  if we are using a smbus_hub , I think we should write the channel number  we want to enable to this register. for example , if my memory controller is on channel 2 , we should write  outb(2,smbus_io_base+SMBHSTCMD).

So could that be changed to    outb(val,smbus_io_base + SMBHSTCMD) ?

Thanks

bxshi