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authorKyösti Mälkki <kyosti.malkki@gmail.com>2018-05-17 14:16:03 +0300
committerKyösti Mälkki <kyosti.malkki@gmail.com>2018-06-02 21:56:06 +0000
commit4c0e277e4ea358f7a36a75b503def54578fcd536 (patch)
treeca70cb5959a95d0cf5302c5ef1bbec248fe6f50f /src
parent717b6e3151b6ea42aaa4b1ab2a708e143d098878 (diff)
downloadcoreboot-4c0e277e4ea358f7a36a75b503def54578fcd536.tar.xz
intel/e7505: Assume AGP slot disabled
Reducing two AGP aperture windows from default 256 MiB to chipset minimum 4 MiB releases 504 MiB of unused MMIO space. Thus we can decrease MMIO space reserve from 1024 MiB to 512 MiB. Supported CPUs are 32-bit with PAE, so there is a little reason to avoid overlarge MMIO region. Change-Id: I34818e1ca36058309c7c5c295992ba6dda154acc Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Reviewed-on: https://review.coreboot.org/26758 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src')
-rw-r--r--src/northbridge/intel/e7505/e7505.h5
-rw-r--r--src/northbridge/intel/e7505/raminit.c20
2 files changed, 21 insertions, 4 deletions
diff --git a/src/northbridge/intel/e7505/e7505.h b/src/northbridge/intel/e7505/e7505.h
index 9c9171d2bd..5ceeacceaf 100644
--- a/src/northbridge/intel/e7505/e7505.h
+++ b/src/northbridge/intel/e7505/e7505.h
@@ -42,6 +42,7 @@
#define DRC 0x7C /* DRAM Controller Mode register, 32 bit */
#define DRDCTL 0x80 /* DRAM Read Timing Control register, 16 bit? (if similar to 855PM) */
#define CKDIS 0x8C /* Clock disable register, 8 bit */
+#define APSIZE 0xB4
#define TOLM 0xC4 /* Top of Low Memory register, 16 bit */
#define REMAPBASE 0xC6 /* Remap Base Address register, 16 bit */
#define REMAPLIMIT 0xC8 /* Remap Limit Address register, 16 bit */
@@ -82,4 +83,8 @@
#define DRAM_FERR 0x80 /* DRAM first error register, 8 bits */
#define DRAM_NERR 0x82 /* DRAM next error register, 8 bits */
+/************ D1:F0 ************/
+
+#define APSIZE1 0x74
+
#endif /* NORTHBRIDGE_INTEL_E7505_E7505_H */
diff --git a/src/northbridge/intel/e7505/raminit.c b/src/northbridge/intel/e7505/raminit.c
index 7464a722fa..1cbed5ab3d 100644
--- a/src/northbridge/intel/e7505/raminit.c
+++ b/src/northbridge/intel/e7505/raminit.c
@@ -68,9 +68,10 @@ Definitions:
#define E7501_SDRAM_MODE (SDRAM_BURST_INTERLEAVED | SDRAM_BURST_4)
#define SPD_ERROR "Error reading SPD info\n"
-#define MCHDEV PCI_DEV(0,0,0)
-#define RASDEV PCI_DEV(0,0,1)
-#define D060DEV PCI_DEV(0,6,0)
+#define MCHDEV PCI_DEV(0, 0, 0)
+#define RASDEV PCI_DEV(0, 0, 1)
+#define AGPDEV PCI_DEV(0, 1, 0)
+#define D060DEV PCI_DEV(0, 6, 0)
// NOTE: This used to be 0x100000.
// That doesn't work on systems where A20M# is asserted, because
@@ -853,6 +854,9 @@ static void configure_e7501_ram_addresses(const struct mem_controller
uint64_t tolm, tom;
uint16_t reg;
+ /* FIXME: Is there standard presence detect bit somewhere. */
+ const int agp_slot_disabled = 1;
+
/* Start with disabled remap range. */
uint16_t remapbase_r = 0x3ff;
uint16_t remaplimit_r = 0;
@@ -888,7 +892,15 @@ static void configure_e7501_ram_addresses(const struct mem_controller
tom = total_dram_64M_multiple * 64ULL * MiB;
/* Reserve MMIO space. */
- tolm = 4ULL * GiB - 1 * GiB;
+ tolm = 4ULL * GiB - 512 * MiB;
+ if (agp_slot_disabled) {
+ /* Reduce apertures to 2 x 4 MiB. */
+ pci_write_config8(MCHDEV, APSIZE, 0x3F);
+ pci_write_config16(AGPDEV, APSIZE1, 0x3F);
+ } else {
+ /* Add MMIO reserve for 2 x 256 MiB apertures. */
+ tolm -= 512 * MiB;
+ }
tolm = MIN(tolm, tom);
/* The PCI memory hole overlaps memory setup the remap window. */