ppc4xx: (Re-)Enable CONFIG_PCI_PNP on AMCC 440EPx Sequoia
The 440EPx has a problem when the PCI_CACHE_LINE_SIZE register is
set to non-zero, because it doesn't support MRM (memory-read-
multiple) correctly. We now added the possibility to configure
this register in the board config file, so that the default value
of 8 can be overridden.
Here the details of this patch:
o drivers_pci_auto.c: introduce CFG_PCI_CACHE_LINE_SIZE to allow
board-specific settings. As an example the sequoia board requires 0.
Idea from Stefan Roese <sr@denx.de>.
o board/amcc/sequoia/init.S: add a TLB mapping at 0xE8000000 for the
PCI IO-space. Obtained from Stefan Roese <sr@denx.de>.
o include/configs/sequoia.h: turn CONFIG_PCI_PNP back on and set
CFG_PCI_CACHE_LINE_SIZE to 0.
Signed-off-by: Gary Jennejohn <garyj@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/sequoia.h b/include/configs/sequoia.h
index 824a812..c2e1386 100644
--- a/include/configs/sequoia.h
+++ b/include/configs/sequoia.h
@@ -400,7 +400,8 @@
*----------------------------------------------------------------------*/
/* General PCI */
#define CONFIG_PCI /* include pci support */
-#undef CONFIG_PCI_PNP /* do (not) pci plug-and-play */
+#define CONFIG_PCI_PNP /* do pci plug-and-play */
+#define CFG_PCI_CACHE_LINE_SIZE 0 /* to avoid problems with PNP */
#define CONFIG_PCI_SCAN_SHOW /* show pci devices on startup */
#define CFG_PCI_TARGBASE 0x80000000 /* PCIaddr mapped to CFG_PCI_MEMBASE*/