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* Switched default PCI speed for 8540 ADS back to 33MHz

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* Added comments and a printf to warn that PCI-X won't
  work at 33MHz
  Patch by Andy Fleming 17-Mar-2006

Signed-off-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
Matthew McClintock 2006-06-28 10:47:03 -05:00
parent e4c2a0eb0c
commit 38433ccc58
3 changed files with 11 additions and 1 deletions
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3
cpu/mpc85xx/pci.c
View File

@ -72,6 +72,9 @@ pci_mpc85xx_init(struct pci_controller *board_hose)
if (!(gur->pordevsr & PORDEVSR_PCI)) {
/* PCI-X init */
if (CONFIG_SYS_CLK_FREQ < 66000000)
printf("PCI-X will only work at 66 MHz\n");
reg16 = PCI_X_CMD_MAX_SPLIT | PCI_X_CMD_MAX_READ
| PCI_X_CMD_ERO | PCI_X_CMD_DPERR_E;
pci_hose_write_config_word(hose, dev, PCIX_COMMAND, reg16);

3
doc/README.mpc85xxads
View File

@ -100,6 +100,9 @@ Updated 13-July-2004 Jon Loeliger
SW7[1:4] = 0101 = 5 => 5 x 66 = 330 CCB Sysclk
SW7[5:6] = 01 => 5:2 x 330 = 825 Core clock
In order to use PCI-X (only in the first PCI slot. The one with
the RIO connector), you need to set SW1[4] (config) to 1 (off).
Also, configure the board to run PCI at 66 MHz.
2. MEMORY MAP TO WORK WITH LINUX KERNEL

6
include/configs/MPC8540ADS.h
View File

@ -68,10 +68,14 @@
* The board, however, can run at 66MHz. In any event, this value
* must match the settings of some switches. Details can be found
* in the README.mpc85xxads.
*
* XXX -- Can't we run at 66 MHz, anyway? PCI should drop to
* 33MHz to accommodate, based on a PCI pin.
* Note that PCI-X won't work at 33MHz.
*/
#ifndef CONFIG_SYS_CLK_FREQ
#define CONFIG_SYS_CLK_FREQ 66000000
#define CONFIG_SYS_CLK_FREQ 33000000
#endif