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[POWERPC] Fix typos in booting-without-of.txt

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Fix typos + some cosmetic changes.

Signed-off-by: Domen Puncer <domen.puncer@telargo.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Domen Puncer 2007-03-02 21:44:45 +11:00 committed by Paul Mackerras
parent 2e0c3370b3
commit 5dd60166c2
1 changed files with 39 additions and 41 deletions
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80
Documentation/powerpc/booting-without-of.txt
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@ -39,7 +39,7 @@
and property data. The old style variable
alignment would make it impossible to do
"simple" insertion of properties using
memove (thanks Milton for
memmove (thanks Milton for
noticing). Updated kernel patch as well
- Correct a few more alignment constraints
- Add a chapter about the device-tree
@ -55,7 +55,7 @@
ToDo:
- Add some definitions of interrupt tree (simple/complex)
- Add some definitions for pci host bridges
- Add some definitions for PCI host bridges
- Add some common address format examples
- Add definitions for standard properties and "compatible"
names for cells that are not already defined by the existing
@ -114,7 +114,7 @@ it with special cases.
forth words isn't required), you can enter the kernel with:
r5 : OF callback pointer as defined by IEEE 1275
bindings to powerpc. Only the 32 bit client interface
bindings to powerpc. Only the 32-bit client interface
is currently supported
r3, r4 : address & length of an initrd if any or 0
@ -194,7 +194,7 @@ it with special cases.
for this is to keep kernels on embedded systems small and efficient;
part of this is due to the fact the code is already that way. In the
future, a kernel may support multiple platforms, but only if the
platforms feature the same core architectire. A single kernel build
platforms feature the same core architecture. A single kernel build
cannot support both configurations with Book E and configurations
with classic Powerpc architectures.
@ -215,7 +215,7 @@ of the boot sequences.... someone speak up if this is wrong!
enable another config option to select the specific board
supported.
NOTE: If ben doesn't merge the setup files, may need to change this to
NOTE: If Ben doesn't merge the setup files, may need to change this to
point to setup_32.c
@ -256,7 +256,7 @@ struct boot_param_header {
u32 off_dt_struct; /* offset to structure */
u32 off_dt_strings; /* offset to strings */
u32 off_mem_rsvmap; /* offset to memory reserve map
*/
*/
u32 version; /* format version */
u32 last_comp_version; /* last compatible version */
@ -276,7 +276,7 @@ struct boot_param_header {
#define OF_DT_HEADER 0xd00dfeed /* 4: version,
4: total size */
#define OF_DT_BEGIN_NODE 0x1 /* Start node: full name
*/
*/
#define OF_DT_END_NODE 0x2 /* End node */
#define OF_DT_PROP 0x3 /* Property: name off,
size, content */
@ -313,9 +313,8 @@ struct boot_param_header {
- off_mem_rsvmap
This is an offset from the beginning of the header to the start
of the reserved memory map. This map is a list of pairs of 64
of the reserved memory map. This map is a list of pairs of 64-
bit integers. Each pair is a physical address and a size. The
list is terminated by an entry of size 0. This map provides the
kernel with a list of physical memory areas that are "reserved"
and thus not to be used for memory allocations, especially during
@ -328,7 +327,7 @@ struct boot_param_header {
contain _at least_ this DT block itself (header,total_size). If
you are passing an initrd to the kernel, you should reserve it as
well. You do not need to reserve the kernel image itself. The map
should be 64 bit aligned.
should be 64-bit aligned.
- version
@ -478,7 +477,7 @@ referencing another node via "phandle" is when laying out the
interrupt tree which will be described in a further version of this
document.
This "linux, phandle" property is a 32 bit value that uniquely
This "linux, phandle" property is a 32-bit value that uniquely
identifies a node. You are free to use whatever values or system of
values, internal pointers, or whatever to generate these, the only
requirement is that every node for which you provide that property has
@ -488,7 +487,7 @@ Here is an example of a simple device-tree. In this example, an "o"
designates a node followed by the node unit name. Properties are
presented with their name followed by their content. "content"
represents an ASCII string (zero terminated) value, while <content>
represents a 32 bit hexadecimal value. The various nodes in this
represents a 32-bit hexadecimal value. The various nodes in this
example will be discussed in a later chapter. At this point, it is
only meant to give you a idea of what a device-tree looks like. I have
purposefully kept the "name" and "linux,phandle" properties which
@ -560,15 +559,15 @@ Here's the basic structure of a single node:
* [align gap to next 4 bytes boundary]
* for each property:
* token OF_DT_PROP (that is 0x00000003)
* 32 bit value of property value size in bytes (or 0 of no
* value)
* 32 bit value of offset in string block of property name
* 32-bit value of property value size in bytes (or 0 if no
value)
* 32-bit value of offset in string block of property name
* property value data if any
* [align gap to next 4 bytes boundary]
* [child nodes if any]
* token OF_DT_END_NODE (that is 0x00000002)
So the node content can be summarised as a start token, a full path,
So the node content can be summarized as a start token, a full path,
a list of properties, a list of child nodes, and an end token. Every
child node is a full node structure itself as defined above.
@ -600,7 +599,7 @@ provide those properties yourself.
----------------------------------------------
The general rule is documented in the various Open Firmware
documentations. If you chose to describe a bus with the device-tree
documentations. If you choose to describe a bus with the device-tree
and there exist an OF bus binding, then you should follow the
specification. However, the kernel does not require every single
device or bus to be described by the device tree.
@ -613,9 +612,9 @@ those properties defining addresses format for devices directly mapped
on the processor bus.
Those 2 properties define 'cells' for representing an address and a
size. A "cell" is a 32 bit number. For example, if both contain 2
size. A "cell" is a 32-bit number. For example, if both contain 2
like the example tree given above, then an address and a size are both
composed of 2 cells, and each is a 64 bit number (cells are
composed of 2 cells, and each is a 64-bit number (cells are
concatenated and expected to be in big endian format). Another example
is the way Apple firmware defines them, with 2 cells for an address
and one cell for a size. Most 32-bit implementations should define
@ -649,7 +648,7 @@ prom_parse.c file of the recent kernels for your bus type.
The "reg" property only defines addresses and sizes (if #size-cells
is non-0) within a given bus. In order to translate addresses upward
(that is into parent bus addresses, and possibly into cpu physical
(that is into parent bus addresses, and possibly into CPU physical
addresses), all busses must contain a "ranges" property. If the
"ranges" property is missing at a given level, it's assumed that
translation isn't possible. The format of the "ranges" property for a
@ -665,9 +664,9 @@ example, for a PCI host controller, that would be a CPU address. For a
PCI<->ISA bridge, that would be a PCI address. It defines the base
address in the parent bus where the beginning of that range is mapped.
For a new 64 bit powerpc board, I recommend either the 2/2 format or
For a new 64-bit powerpc board, I recommend either the 2/2 format or
Apple's 2/1 format which is slightly more compact since sizes usually
fit in a single 32 bit word. New 32 bit powerpc boards should use a
fit in a single 32-bit word. New 32-bit powerpc boards should use a
1/1 format, unless the processor supports physical addresses greater
than 32-bits, in which case a 2/1 format is recommended.
@ -781,7 +780,7 @@ address which can extend beyond that limit.
Required properties:
- device_type : has to be "cpu"
- reg : This is the physical cpu number, it's a single 32 bit cell
- reg : This is the physical CPU number, it's a single 32-bit cell
and is also used as-is as the unit number for constructing the
unit name in the full path. For example, with 2 CPUs, you would
have the full path:
@ -802,7 +801,7 @@ address which can extend beyond that limit.
the kernel timebase/decrementer calibration based on this
value.
- clock-frequency : a cell indicating the CPU core clock frequency
in Hz. A new property will be defined for 64 bit values, but if
in Hz. A new property will be defined for 64-bit values, but if
your frequency is < 4Ghz, one cell is enough. Here as well as
for the above, the common code doesn't use that property, but
you are welcome to re-use the pSeries or Maple one. A future
@ -924,8 +923,7 @@ address which can extend beyond that limit.
The SOC node may contain child nodes for each SOC device that the
platform uses. Nodes should not be created for devices which exist
on the SOC but are not used by a particular platform. See chapter VI
for more information on how to specify devices that are part of an
SOC.
for more information on how to specify devices that are part of a SOC.
Example SOC node for the MPC8540:
@ -988,7 +986,7 @@ The syntax of the dtc tool is
[-o output-filename] [-V output_version] input_filename
The "output_version" defines what versio of the "blob" format will be
The "output_version" defines what version of the "blob" format will be
generated. Supported versions are 1,2,3 and 16. The default is
currently version 3 but that may change in the future to version 16.
@ -1010,12 +1008,12 @@ supported currently at the toplevel.
*/
property2 = <1234abcd>; /* define a property containing a
* numerical 32 bits value (hexadecimal)
* numerical 32-bit value (hexadecimal)
*/
property3 = <12345678 12345678 deadbeef>;
/* define a property containing 3
* numerical 32 bits values (cells) in
* numerical 32-bit values (cells) in
* hexadecimal
*/
property4 = [0a 0b 0c 0d de ea ad be ef];
@ -1084,7 +1082,7 @@ while all this has been defined and implemented.
its usage in early_init_devtree(), and the corresponding various
early_init_dt_scan_*() callbacks. That code can be re-used in a
GPL bootloader, and as the author of that code, I would be happy
to discuss possible free licencing to any vendor who wishes to
to discuss possible free licensing to any vendor who wishes to
integrate all or part of this code into a non-GPL bootloader.
@ -1093,7 +1091,7 @@ VI - System-on-a-chip devices and nodes
=======================================
Many companies are now starting to develop system-on-a-chip
processors, where the processor core (cpu) and many peripheral devices
processors, where the processor core (CPU) and many peripheral devices
exist on a single piece of silicon. For these SOCs, an SOC node
should be used that defines child nodes for the devices that make
up the SOC. While platforms are not required to use this model in
@ -1300,10 +1298,10 @@ platforms are moved over to use the flattened-device-tree model.
and additions :
Required properties :
- compatible : Should be "fsl-usb2-mph" for multi port host usb
controllers, or "fsl-usb2-dr" for dual role usb controllers
- phy_type : For multi port host usb controllers, should be one of
"ulpi", or "serial". For dual role usb controllers, should be
- compatible : Should be "fsl-usb2-mph" for multi port host USB
controllers, or "fsl-usb2-dr" for dual role USB controllers
- phy_type : For multi port host USB controllers, should be one of
"ulpi", or "serial". For dual role USB controllers, should be
one of "ulpi", "utmi", "utmi_wide", or "serial".
- reg : Offset and length of the register set for the device
- port0 : boolean; if defined, indicates port0 is connected for
@ -1327,7 +1325,7 @@ platforms are moved over to use the flattened-device-tree model.
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
Example multi port host usb controller device node :
Example multi port host USB controller device node :
usb@22000 {
device_type = "usb";
compatible = "fsl-usb2-mph";
@ -1341,7 +1339,7 @@ platforms are moved over to use the flattened-device-tree model.
port1;
};
Example dual role usb controller device node :
Example dual role USB controller device node :
usb@23000 {
device_type = "usb";
compatible = "fsl-usb2-dr";
@ -1375,7 +1373,7 @@ platforms are moved over to use the flattened-device-tree model.
- channel-fifo-len : An integer representing the number of
descriptor pointers each channel fetch fifo can hold.
- exec-units-mask : The bitmask representing what execution units
(EUs) are available. It's a single 32 bit cell. EU information
(EUs) are available. It's a single 32-bit cell. EU information
should be encoded following the SEC's Descriptor Header Dword
EU_SEL0 field documentation, i.e. as follows:
@ -1391,7 +1389,7 @@ platforms are moved over to use the flattened-device-tree model.
bits 8 through 31 are reserved for future SEC EUs.
- descriptor-types-mask : The bitmask representing what descriptors
are available. It's a single 32 bit cell. Descriptor type
are available. It's a single 32-bit cell. Descriptor type
information should be encoded following the SEC's Descriptor
Header Dword DESC_TYPE field documentation, i.e. as follows:
@ -1480,7 +1478,7 @@ platforms are moved over to use the flattened-device-tree model.
Required properties:
- device_type : should be "spi".
- compatible : should be "fsl_spi".
- mode : the spi operation mode, it can be "cpu" or "qe".
- mode : the SPI operation mode, it can be "cpu" or "qe".
- reg : Offset and length of the register set for the device
- interrupts : <a b> where a is the interrupt number and b is a
field that represents an encoding of the sense and level
@ -1706,7 +1704,7 @@ platforms are moved over to use the flattened-device-tree model.
- partitions : Several pairs of 32-bit values where the first value is
partition's offset from the start of the device and the second one is
partition size in bytes with LSB used to signify a read only
partition (so, the parition size should always be an even number).
partition (so, the partition size should always be an even number).
- partition-names : The list of concatenated zero terminated strings
representing the partition names.
- probe-type : The type of probe which should be done for the chip