[people/ms/u-boot.git] / doc / README.ARM-SoC

[By Steven Scholz <steven.scholz@imc-berlin.de>, 16 Aug 2004]

Since the cpu/ directory gets clobbered with peripheral driver code I
started cleaning up arch/arm/cpu/arm920t.

I introduced the concept of Soc (system on a chip) into the ./cpu
directory. That means that code that is cpu (i.e. core) specific
resides in

	$(CPUDIR)/

and code that is specific to some SoC (i.e. vendor specific
peripherals around the core) is moved into

	$(CPUDIR)/$(SOC)/

Thus a library/archive "$(CPUDIR)/$(SOC)/lib$(SOC).a" will be build
and linked. Examples will be

	arch/arm/cpu/arm920t/imx/
	arch/arm/cpu/arm920t/s3c24x0

One can select an SoC by passing the name of it to ./mkconfig just
like

	@./mkconfig $(@:_config=) arm arm920t vcma9 mpl s3c24x0

If there's no VENDOR field (like "mpl" in the above line) one has to
pass NULL instead:

	@./mkconfig $(@:_config=) arm arm920t mx1ads NULL imx
Commit	Line	Data
1d9f4105 WD	1	[By Steven Scholz <steven.scholz@imc-berlin.de>, 16 Aug 2004]
	2
	3	Since the cpu/ directory gets clobbered with peripheral driver code I
84ad6884	4	started cleaning up arch/arm/cpu/arm920t.
1d9f4105 WD	5
	6	I introduced the concept of Soc (system on a chip) into the ./cpu
	7	directory. That means that code that is cpu (i.e. core) specific
	8	resides in
	9
03b7004d	10	$(CPUDIR)/
1d9f4105 WD	11
	12	and code that is specific to some SoC (i.e. vendor specific
	13	peripherals around the core) is moved into
	14
03b7004d	15	$(CPUDIR)/$(SOC)/
1d9f4105	16
03b7004d	17	Thus a library/archive "$(CPUDIR)/$(SOC)/lib$(SOC).a" will be build
1d9f4105 WD	18	and linked. Examples will be
1d9f4105 WD	19
84ad6884 PT	20	arch/arm/cpu/arm920t/imx/
84ad6884 PT	21	arch/arm/cpu/arm920t/s3c24x0
1d9f4105 WD	22
	23	One can select an SoC by passing the name of it to ./mkconfig just
	24	like
	25
	26	@./mkconfig $(@:_config=) arm arm920t vcma9 mpl s3c24x0
	27
	28	If there's no VENDOR field (like "mpl" in the above line) one has to
	29	pass NULL instead:
	30
	31	@./mkconfig $(@:_config=) arm arm920t mx1ads NULL imx