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authorUwe Hermann <uwe@hermann-uwe.de>2006-11-07 11:16:21 +0000
committerUwe Hermann <uwe@hermann-uwe.de>2006-11-07 11:16:21 +0000
commitc65113cec7c628ab55f71114db5b13b2f2967db4 (patch)
treeb562a7027d17ee2039a86260b4c2d9574694247a /util
parent10fd79ae81fc97bded227ec587acfcdc895539db (diff)
downloadcoreboot-c65113cec7c628ab55f71114db5b13b2f2967db4.tar.xz
Fix some code comments of the Intel PIIX4/PIIX4E/PIIX4M code.
Add detailed instructions on how and where to get the datasheet, its name, and order number (Closes #34). Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2493 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util')
-rw-r--r--util/flashrom/flash_enable.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/util/flashrom/flash_enable.c b/util/flashrom/flash_enable.c
index dd53f0eb71..901144ca5f 100644
--- a/util/flashrom/flash_enable.c
+++ b/util/flashrom/flash_enable.c
@@ -77,7 +77,12 @@ static int enable_flash_sis630(struct pci_dev *dev, char *name)
return 0;
}
-/* Datasheet: http://www.intel.com/design/intarch/datashts/290562.htm */
+/* Datasheet:
+ * - Name: 82371AB PCI-TO-ISA / IDE XCELERATOR (PIIX4)
+ * - URL: http://www.intel.com/design/intarch/datashts/290562.htm
+ * - PDF: http://www.intel.com/design/intarch/datashts/29056201.pdf
+ * - Order Number: 290562-001
+ */
static int enable_flash_piix4(struct pci_dev *dev, char *name)
{
uint16_t old, new;
@@ -90,10 +95,11 @@ static int enable_flash_piix4(struct pci_dev *dev, char *name)
Set bit 7: Extended BIOS Enable (PCI master accesses to
FFF80000-FFFDFFFF are forwarded to ISA).
Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to
- the lower 64-Kbyte BIOS block (E00000­EFFFF) at the top
+ the lower 64-Kbyte BIOS block (E0000-EFFFF) at the top
of 1 Mbyte, or the aliases at the top of 4 Gbyte
- (FFFE0000-FFFEFFF) result in the generation of BIOSCS#.
- Set bit 2: BIOSCS# Write Protect Enable (1=enable, 0=disable). */
+ (FFFE0000-FFFEFFFF) result in the generation of BIOSCS#.
+ Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
+ Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable). */
new = old | 0x2c4;
if (new == old)