hard coded value for idcode field in struct cpu_table

2011/3/6 Madhavi Manchala [off-list ref]:

2011/3/5 S?awomir Cygan [off-list ref]:

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On Thu, Mar 3, 2011 at 2:49 PM, Madhavi Manchala
[off-list ref] wrote:

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Dear All,

I do not understand the value of idcode field in the struct cpu_table
i.e. the value is hard coded. I did not find that value in the user
manuals also. The code is available at
linux/arch/arm/plat-s3c24xx/cpu.c file. Currently, I am implementing
code for Samsung S3C2510A processor which is not available in the
current sources. Where can I find the idcode value for Samsung
S3C2510A processor?

Any ideas will be appreciated.

Thanks and ?Regards,
Madhavi M.

Hi,
This field is defined for example in this datasheed:

http://www.alldatasheet.com/datasheet-pdf/pdf/84872/SAMSUNG/S3C2410A.html

PDF page 282:

GENERAL STATUS REGISTER (GSTATUSn)
Register Address R/W Description Reset Value
GSTATUS0 0x560000AC R External pin status Undefined

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? GSTATUS1 0x560000B0 R Chip ID 0x32410000 <<<

GSTATUS2 0x560000B4 R/W Reset status 0x1
GSTATUS3 0x560000B8 R/W Infrom register 0x0
GSTATUS4 0x560000BC R/W Infrom register 0x0

This is "GSTATUS1" register initial value


I don't think that S3c25 are so similar to S3c25, so they provide
exactly the same method of chip identification.

Thank you very much Slawomir Cygan for the information. However, I did
not find any CHIP ID in the S3C2510A documentation, as you said. There
are IDs which are PCI vendor ID and device ID. I guess, this is
different from that chip ID as in case S3C2410A.

Thanks and Regards,
Madhavi M.

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--
Pozdrawiam,
S?awomir Cygan

At first glance the datasheets are quite different, the assumption
that S3C24xx are similar to S3C25xx may not be so good.

And the second thing: You were asking about cpu identification code
snippet, which can be omitted at all at least for the beginning (we
now know which cpu model we boot, aren't we?).

-- 
Pozdrawiam,
S?awomir Cygan