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Fix some code comments of the Intel PIIX4/PIIX4E/PIIX4M code

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Add detailed instructions on how and where to get the datasheet,
its name, and order number.

Corresponding to flashrom svn r70 and coreboot v2 svn r2493.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> 
Acked-by: Stefan Reinauer <stepan@coresystems.de>
This commit is contained in:
Uwe Hermann 2006-11-07 11:16:21 +00:00
parent c6b5f4913b
commit 987942dcbd
1 changed files with 10 additions and 4 deletions
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14
flash_enable.c
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@ -77,7 +77,12 @@ static int enable_flash_sis630(struct pci_dev *dev, char *name)
return 0; 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) static int enable_flash_piix4(struct pci_dev *dev, char *name)
{ {
uint16_t old, new; 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 Set bit 7: Extended BIOS Enable (PCI master accesses to
FFF80000-FFFDFFFF are forwarded to ISA). FFF80000-FFFDFFFF are forwarded to ISA).
Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to 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 of 1 Mbyte, or the aliases at the top of 4 Gbyte
(FFFE0000-FFFEFFF) result in the generation of BIOSCS#. (FFFE0000-FFFEFFFF) result in the generation of BIOSCS#.
Set bit 2: BIOSCS# Write Protect Enable (1=enable, 0=disable). */ Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable). */
new = old | 0x2c4; new = old | 0x2c4;
if (new == old) if (new == old)