[LinuxBIOS] MCP55 LinuxBIOS with USB debug
Lu, Yinghai
yinghai.lu at amd.com
Tue Jan 23 18:04:50 CET 2007
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
________________________________
From: linuxbios-bounces at linuxbios.org
[mailto:linuxbios-bounces at linuxbios.org] On Behalf Of bxshi
Sent: Monday, January 22, 2007 11:04 PM
To: yinghailu at gmail.com
Cc: linuxbios at 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
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