Attached patch fixes the LPC decode ranges of SB700. We enable early only Serial/SIO/RTC. Everything else needs to be done by lpc.c Problem was that early settings survived, because the lpc.c is doing ORs only...

Hence we decode quite a lot and even strange ranges like IO port 0x4600 etc...

Also, if some port which does not fit to predefined set is requested, like 0x290 for Hardware monitor, the wide port is done, but in our case it has range 512 bytes which means we decode in fact 0x290 - 0x490. And if we hit GPU in the 0x3bx range I receive MCE exception if I do isadump -f 0x300 which is bad.
Therefore If I detect that the requested range is small (16 bytes) I additionally set the small wide io region so only 16 bytes is decoded.

While at it, I fix spelling typos and I init the regs so we don't write random garbage to regs even if we don't enable them later.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz> 
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6316 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 1 insertions, 18 deletions

diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c
index cd5221742b..552086a7eb 100644
--- a/src/southbridge/amd/sb700/early_setup.c
+++ b/src/southbridge/amd/sb700/early_setup.c
@@ -411,25 +411,8 @@ static void sb700_devices_por_init(void)
 	/* DMA enable */
 	pci_write_config8(dev, 0x40, 0x04);
 
-	/* IO Port Decode Enable */
-	pci_write_config8(dev, 0x44, 0xFF);
-	pci_write_config8(dev, 0x45, 0xFF);
-	pci_write_config8(dev, 0x46, 0xC3);
-	pci_write_config8(dev, 0x47, 0xFF);
-
-	// TODO: This has already been done(?)
-	/* IO/Mem Port Decode Enable, I don't know why CIM disable some ports.
-	 *  Disable LPC TimeOut counter, enable SuperIO Configuration Port (2e/2f),
-	 * Alternate Super I/O Configuration Port (4e/4f), Wide Generic IO Port (64/65). */
-	byte = pci_read_config8(dev, 0x48);
-	byte |= (1 << 1) | (1 << 0);	/* enable Super IO config port 2e-2h, 4e-4f */
-	byte |= 1 << 6;		/* enable for RTC I/O range */
-	pci_write_config8(dev, 0x48, byte);
+	/* LPC Sync Timeout */
 	pci_write_config8(dev, 0x49, 0xFF);
-	/* Enable 0x480-0x4bf, 0x4700-0x470B */
-	byte = pci_read_config8(dev, 0x4A);
-	byte |= ((1 << 1) + (1 << 6));	/*0x42, save the configuraion for port 0x80. */
-	pci_write_config8(dev, 0x4A, byte);
 
 	/* Enable Tpm12_en and Tpm_legacy. I don't know what is its usage and copied from CIM. */
 	pci_write_config8(dev, 0x7C, 0x05);