Hi Dave,
Have you checked out the clock connected to LPC? On W311, FS2 can be set to 24 or 48 MHz. It could be the problem, since I have similar problem with USB on a custom cle266 board. FYI, it can be programmed thru smb. Here is from we have done to program the USB clock.
#define SMB_BASE_ADDRESS 0x5000
#define SMB_STATUS (SMB_BASE_ADDRESS + 0) #define SMB_CONTROL (SMB_BASE_ADDRESS + 2) #define SMB_COMMAND (SMB_BASE_ADDRESS + 3) #define SMB_ADDRESS (SMB_BASE_ADDRESS + 4) #define SMB_DATA (SMB_BASE_ADDRESS + 5)
#define I2C_TRANS_CMD 0x40 #define CLOCK_SLAVE_ADDRESS 0x69
static void ext_clock_fixup(void) { int dt; struct pci_dev *dev;
dev = pci_find_device(PCI_VENDOR_ID_VIA, 0x3177, 0); if (dev != NULL) { printk_info("ext clock setting\n");
// SMB IO address 5000h pci_write_config_byte(dev, 0xD1, (SMB_BASE_ADDRESS>>8)&0xff ); pci_write_config_byte(dev, 0xD0, SMB_BASE_ADDRESS&0xff ); // enable SMB pci_write_config_byte(dev, 0xD2, 0x01);
// clear status outb( 0xff, SMB_STATUS );
// USB out 48MHz outb( 0x7f, SMB_DATA ); outb( 0x83, SMB_COMMAND ); outb( (CLOCK_SLAVE_ADDRESS<<1), SMB_ADDRESS ); outb( 0x8|I2C_TRANS_CMD, SMB_CONTROL );
while( inb(SMB_STATUS) & 0x01 ); }
}
You may want to put similar code in serial init. Hope this help.
-Andrew
On Wed, Dec 17, 2003 at 11:13:02AM -0800, Dave Ashley wrote:
I am at my wits end regarding how to get the serial ports on the epia-m to run at full 115,200 baud rate. Here is a summary of what is known:
- The serial ports are driven by the VT1211 superio chip.
- Under AWARD bios the serial ports are capable of 115,200 operation.
- Under linuxbios they can only run at 57,600 max.
- Booting up with AWARD then soft reset (or hit reset button on motherboard)
into linuxbios still maintains 115,200 baud 5) Hard reset (power off then on) into linuxbios reduces maximum baud rate to 57,600. 6) All registers of the VT1211 are identical after linuxbios bootup, whether from award -> softreset -> linuxbios bootup or hardreset -> linuxbios bootup. I am speaking of all registers of all logical devices of the VT1211, including all the global registers. I wrote a program to dump everything then diff'd the two outputs, they're identical.
I have repeatedly tried asking VIA for help, in various different ways. The VT1211 datasheet and the VT1211 bios porting guide have not resolved the issue. VIA has proven incapable of addressing the problem.
I have one last idea. There is an emulator to test VGA bios's, I was messing with it a few months back. Is there an emulator for the full BIOS? I'd like to be able to watch all io port accesses of the award bios, maybe I can trap when it goes to write to the 0x2e + 0x2f io ports to configure the vt1211 serial ports, then look for something near there that might be related. The idea would be to figure out what magical thing the AWARD bios is doing to initialize the serial port.
Failing that is there any way to disassemble a BIOS image?
Any ideas welcome.
BTW if anyone has figured out how to fix the problem, please just f*cking out with it, I think I've been very generous in the past with enhancements and turnabout is fair play.
Thanks-- Dave
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