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Subject[PATCH]Re: [Fwd: Re: OOPS in agpgart (2.4.13, 2.4.15pre7)]
Hello again


Here is a patch that _might_ improve things wrt. agp support for i830
chipsets. I do not have a i830 box at hand, so it has not been tested
(well, it compiles ok. ;-). If you feel like crashing your PC once more,
try the patch (against 2.4.15) and tell me whether things became
better/worse.
I assumed that the i830mg without secondary device was working in a way
that is similar to other Intel chipsets.

Good luck :-)

Nicolas.
--
Nicolas Aspert Signal Processing Laboratory (LTS)
Swiss Federal Institute of Technology (EPFL)
diff -Nru linux-2.4.15.clean/drivers/char/agp/agp.h linux-2.4.15.dirty/drivers/char/agp/agp.h
--- linux-2.4.15.clean/drivers/char/agp/agp.h Fri Nov 9 23:01:21 2001
+++ linux-2.4.15.dirty/drivers/char/agp/agp.h Mon Nov 26 13:25:56 2001
@@ -276,6 +276,8 @@
#define I830_RDRAM_ND(x) (((x) & 0x20) >> 5)
#define I830_RDRAM_DDT(x) (((x) & 0x18) >> 3)

+#define INTEL_I830_ERRSTS 0x92
+
/* intel i820 registers */
#define INTEL_I820_RDCR 0x51
#define INTEL_I820_ERRSTS 0xc8
diff -Nru linux-2.4.15.clean/drivers/char/agp/agpgart_be.c linux-2.4.15.dirty/drivers/char/agp/agpgart_be.c
--- linux-2.4.15.clean/drivers/char/agp/agpgart_be.c Fri Nov 16 19:11:22 2001
+++ linux-2.4.15.dirty/drivers/char/agp/agpgart_be.c Mon Nov 26 13:35:29 2001
@@ -1705,6 +1705,38 @@
return 0;
}

+static int intel_830mg_configure(void)
+{
+ u32 temp;
+ u16 temp2;
+ aper_size_info_8 *current_size;
+
+ current_size = A_SIZE_8(agp_bridge.current_size);
+
+ /* aperture size */
+ pci_write_config_byte(agp_bridge.dev, INTEL_APSIZE,
+ current_size->size_value);
+
+ /* address to map to */
+ pci_read_config_dword(agp_bridge.dev, INTEL_APBASE, &temp);
+ agp_bridge.gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
+
+ /* attbase - aperture base */
+ pci_write_config_dword(agp_bridge.dev, INTEL_ATTBASE,
+ agp_bridge.gatt_bus_addr);
+
+ /* agpctrl */
+ pci_write_config_dword(agp_bridge.dev, INTEL_AGPCTRL, 0x0000);
+
+ /* gmch */
+ pci_read_config_word(agp_bridge.dev, INTEL_NBXCFG, &temp2);
+ pci_write_config_word(agp_bridge.dev, INTEL_NBXCFG,
+ temp2 | (1 << 9));
+ /* clear any possible AGP-related error conditions */
+ pci_write_config_word(agp_bridge.dev, INTEL_I830_ERRSTS, 0x1c);
+ return 0;
+}
+
static unsigned long intel_mask_memory(unsigned long addr, int type)
{
/* Memory type is ignored */
@@ -1745,6 +1777,14 @@
{4, 1024, 0, 63}
};

+static aper_size_info_8 intel_830mg_sizes[4] =
+{
+ {256, 65536, 6, 0},
+ {128, 32768, 5, 32},
+ {64, 16384, 4, 48},
+ {32, 8192, 3, 56}
+};
+
static int __init intel_generic_setup (struct pci_dev *pdev)
{
agp_bridge.masks = intel_generic_masks;
@@ -1809,6 +1849,35 @@
(void) pdev; /* unused */
}

+static int __init intel_830mg_setup (struct pci_dev *pdev)
+{
+ agp_bridge.masks = intel_generic_masks;
+ agp_bridge.num_of_masks = 1;
+ agp_bridge.aperture_sizes = (void *) intel_830mg_sizes;
+ agp_bridge.size_type = U8_APER_SIZE;
+ agp_bridge.num_aperture_sizes = 4;
+ agp_bridge.dev_private_data = NULL;
+ agp_bridge.needs_scratch_page = FALSE;
+ agp_bridge.configure = intel_830mg_configure;
+ agp_bridge.fetch_size = intel_8xx_fetch_size;
+ agp_bridge.cleanup = intel_8xx_cleanup;
+ agp_bridge.tlb_flush = intel_8xx_tlbflush;
+ agp_bridge.mask_memory = intel_mask_memory;
+ agp_bridge.agp_enable = agp_generic_agp_enable;
+ agp_bridge.cache_flush = global_cache_flush;
+ agp_bridge.create_gatt_table = agp_generic_create_gatt_table;
+ agp_bridge.free_gatt_table = agp_generic_free_gatt_table;
+ agp_bridge.insert_memory = agp_generic_insert_memory;
+ agp_bridge.remove_memory = agp_generic_remove_memory;
+ agp_bridge.alloc_by_type = agp_generic_alloc_by_type;
+ agp_bridge.free_by_type = agp_generic_free_by_type;
+ agp_bridge.agp_alloc_page = agp_generic_alloc_page;
+ agp_bridge.agp_destroy_page = agp_generic_destroy_page;
+
+ return 0;
+
+ (void) pdev; /* unused */
+}

static int __init intel_840_setup (struct pci_dev *pdev)
{
@@ -3886,11 +3955,13 @@
}

if (i810_dev == NULL) {
- printk(KERN_ERR PFX "Detected an "
+ printk(KERN_INFO PFX "Detected an "
"Intel 830M, but could not find the"
- " secondary device.\n");
- agp_bridge.type = NOT_SUPPORTED;
- return -ENODEV;
+ " secondary device.\n");
+ printk(KERN_INFO PFX "Trying the "
+ "Intel 830MG stuff\n");
+ agp_bridge.type = INTEL_I830_M;
+ return intel_830mg_setup(dev);
}
printk(KERN_INFO PFX "Detected an Intel "
"830M Chipset.\n");
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