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authorTimothy Pearson <tpearson@raptorengineeringinc.com>2015-09-05 17:46:15 -0500
committerPeter Stuge <peter@stuge.se>2015-10-24 07:17:21 +0200
commit70f2736b8eae5aa9e83418c0318da45ca031bb55 (patch)
treec5487c5b6fe6a9c4bfd34e2151e22fcf2d8f0e90
parentb27dfe9998268b56a45a736d7e351b06d4d32a19 (diff)
southbridge/amd/sb700: Fix boot hang on ASUS KGPE-D16
Change-Id: I1d7d6715663a13ab94fd6d71808e35f0f7384d00 Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: http://review.coreboot.org/11938 Tested-by: build bot (Jenkins) Reviewed-by: Peter Stuge <peter@stuge.se>
-rw-r--r--src/southbridge/amd/sb700/Kconfig4
-rw-r--r--src/southbridge/amd/sb700/early_setup.c8
2 files changed, 12 insertions, 0 deletions
diff --git a/src/southbridge/amd/sb700/Kconfig b/src/southbridge/amd/sb700/Kconfig
index 076193447b..bca74fb083 100644
--- a/src/southbridge/amd/sb700/Kconfig
+++ b/src/southbridge/amd/sb700/Kconfig
@@ -42,6 +42,10 @@ config SOUTHBRIDGE_AMD_SB700_SKIP_ISA_DMA_INIT
bool
default n
+config SOUTHBRIDGE_AMD_SB700_DISABLE_ISA_DMA
+ bool
+ default n
+
config EHCI_BAR
hex
default 0xfef00000
diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c
index d25599ea2e..2828bbed51 100644
--- a/src/southbridge/amd/sb700/early_setup.c
+++ b/src/southbridge/amd/sb700/early_setup.c
@@ -439,6 +439,14 @@ static void sb700_devices_por_init(void)
/*pci_write_config8(dev, 0x79, 0x4F); */
pci_write_config8(dev, 0x78, 0xFF);
+ if (IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_SB700_DISABLE_ISA_DMA)) {
+ printk(BIOS_DEBUG, "%s: Disabling ISA DMA support\n", __func__);
+ /* Disable LPC ISA DMA Capability */
+ byte = pci_read_config8(dev, 0x78);
+ byte &= ~(1 << 0);
+ pci_write_config8(dev, 0x78, byte);
+ }
+
/* Set smbus iospace enable, I don't know why write 0x04 into reg5 that is reserved */
pci_write_config16(dev, 0x4, 0x0407);