[Bug 46] New: 266MHz initialization of GTA01Bv2

bugzilla-daemon at gta01.hmw-consulting.de bugzilla-daemon at gta01.hmw-consulting.de
Mon Jan 15 19:27:01 CET 2007


           Summary: 266MHz initialization of GTA01Bv2
           Product: OpenMoko
           Version: current svn head
          Platform: GTA01
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: u-boot
        AssignedTo: laforge at openmoko.org
        ReportedBy: laforge at openmoko.org

The GTA01Bv2 and later have a 266MHz variant of the S3C2410.  our current u-boot
code initializes it with 202MHz, though.

It is not as easy as only to reconfigure the PLL configuration.  If we do that,
we only get a crash very early at bootup.  Either invalid instruction or data abort.

We also need to increase CORE1V8 to 2.0 volts.  Unfortunately our DC converter
in the PMU can only produce 1.8 or 2.1.  Since the S3C2410 266 MHz specs say 2.0
+/- 0.1 volts, the 2.1 volts will do.  I've done this temporarily by using "imw
0x08 0x21 0xe4, but that didn't help either.

I've checked the SDRAM timings, and even at the increased HCLK/MCLK/... they are
within specification.  I2C also should definitely work.  

It seems like it actually crashes somewhere in baudrate_init, before it gets to
serial_init. maybe some overflow.

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