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Fix ICH FWH IDSEL setting with the fwh_idsel= internal programmer parameter

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The code took 32 bits of input and wrote them to an 48 bit register,
duplicating some values.
Document the fwh_idsel= parameter in the man page.

Corresponding to flashrom svn r1389.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
This commit is contained in:
Carl-Daniel Hailfinger
2011-07-25 22:44:09 +00:00
parent a07438302e
commit 46fa068fa2
2 changed files with 44 additions and 7 deletions
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17
flashrom.8
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@ -299,6 +299,23 @@ is the I/O port number (must be a multiple of 8). In the unlikely case
flashrom doesn't detect an active IT87 LPC<->SPI bridge, please send a bug
report so we can diagnose the problem.
.sp
If you have an Intel chipset with an ICH6 or later southbridge and if you want
to set specific IDSEL values for a non-default flash chip or an embedded
controller (EC), you can use the
.sp
.B " flashrom \-p internal:fwh_idsel=value"
.sp
syntax where value is the 48-bit hexadecimal raw value to be written in the
IDSEL registers of the Intel southbridge. The upper 32 bits use one hex digit
each per 512 kB range between 0xffc00000 and 0xffffffff, and the lower 16 bits
use one hex digit each per 1024 kB range between 0xff400000 and 0xff7fffff.
The rightmost hex digit corresponds with the lowest address range. All address
ranges have a corresponding sister range 4 MB below with identical IDSEL
settings. The default value for ICH7 is given in the example below.
.sp
Example:
.B "flashrom \-p internal:fwh_idsel=0x001122334567"
.sp
Using flashrom on laptops is dangerous and may easily make your hardware
unusable (see also the
.B BUGS