[NET]: NPROTO is redundant; it's equal to AF_MAX/PF_MAX.

[linux-2.6-omap-h63xx.git] / Documentation / pci.txt

diff --git a/Documentation/pci.txt b/Documentation/pci.txt
index 7754f5aea4e9b0bdd62280fb4f9fe88b23dce3fc..d2c2e6e2b224ce4bcb84d3870cddfba85cb3b979 100644 (file)
--- a/Documentation/pci.txt
+++ b/Documentation/pci.txt
@@ -123,7 +123,8 @@ initialization with a pointer to a structure describing the driver
 
 
 The ID table is an array of struct pci_device_id entries ending with an
-all-zero entry.  Each entry consists of:
+all-zero entry; use of the macro DEFINE_PCI_DEVICE_TABLE is the preferred
+method of declaring the table.  Each entry consists of:
 
        vendor,device   Vendor and device ID to match (or PCI_ANY_ID)
 
@@ -191,7 +192,8 @@ Tips on when/where to use the above attributes:
 
        o Do not mark the struct pci_driver.
 
-       o The ID table array should be marked __devinitdata.
+       o The ID table array should be marked __devinitconst; this is done
+         automatically if the table is declared with DEFINE_PCI_DEVICE_TABLE().
 
        o The probe() and remove() functions should be marked __devinit
          and __devexit respectively.  All initialization functions
@@ -274,8 +276,6 @@ the PCI device by calling pci_enable_device(). This will:
        o allocate an IRQ (if BIOS did not).
 
 NOTE: pci_enable_device() can fail! Check the return value.
-NOTE2: Also see pci_enable_device_bars() below. Drivers can
-    attempt to enable only a subset of BARs they need.
 
 [ OS BUG: we don't check resource allocations before enabling those
   resources. The sequence would make more sense if we called
@@ -605,40 +605,7 @@ device lists. This is still possible but discouraged.
 
 
 
-10. pci_enable_device_bars() and Legacy I/O Port space
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Large servers may not be able to provide I/O port resources to all PCI
-devices. I/O Port space is only 64KB on Intel Architecture[1] and is
-likely also fragmented since the I/O base register of PCI-to-PCI
-bridge will usually be aligned to a 4KB boundary[2]. On such systems,
-pci_enable_device() and pci_request_region() will fail when
-attempting to enable I/O Port regions that don't have I/O Port
-resources assigned.
-
-Fortunately, many PCI devices which request I/O Port resources also
-provide access to the same registers via MMIO BARs. These devices can
-be handled without using I/O port space and the drivers typically
-offer a CONFIG_ option to only use MMIO regions
-(e.g. CONFIG_TULIP_MMIO). PCI devices typically provide I/O port
-interface for legacy OSes and will work when I/O port resources are not
-assigned. The "PCI Local Bus Specification Revision 3.0" discusses
-this on p.44, "IMPLEMENTATION NOTE".
-
-If your PCI device driver doesn't need I/O port resources assigned to
-I/O Port BARs, you should use pci_enable_device_bars() instead of
-pci_enable_device() in order not to enable I/O port regions for the
-corresponding devices. In addition, you should use
-pci_request_selected_regions() and pci_release_selected_regions()
-instead of pci_request_regions()/pci_release_regions() in order not to
-request/release I/O port regions for the corresponding devices.
-
-[1] Some systems support 64KB I/O port space per PCI segment.
-[2] Some PCI-to-PCI bridges support optional 1KB aligned I/O base.
-
-
-
-11. MMIO Space and "Write Posting"
+10. MMIO Space and "Write Posting"
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Converting a driver from using I/O Port space to using MMIO space