Re: [Qemu-devel] QEMU regression problems

[Roy Tam <roytam@gmail.com>]

2010/4/12 Gerhard Wiesinger <lists@wiesinger.com>:
> Hello,
>
> Checkit reports some problems under DOS:
> 1.) NPU functions are not correct: NPU Trigonometric Functions: FAILED.
> Seems to be a problem of the instruction set.
> 2.) Real-Time Clock Alarm: FAILED (This might be also the reason for the
> KVM problem, see my previous post). Seems to be that real-time clock is not
> working correct.
> 3.) There is also a problem with the reported base memory under QEMM386
> (HIMEM.SYS and EMM386.EXE is correct here). It is 646kB instead of 640kB.
> Therefore base memory test fails. I guess that reporting memory CMOS
> tables/interrupt functions are not implemented correctly.
>
> Details are listed below.
>
> All issues are NOT present under VMWare Server 2.0 and with real hardware.
>
> QEMU: 0.12.3 under Fedora 11, 2.6.30.10-105.2.23.fc11.x86 on AMD Phenom II
> Quad Core, x86_64-softmmu.
>
> Any comments?
>

Tested with Checkit 3.0 and QEMM 9.0.
- The NPU error is confirmed and it seems to be a floating point
rounding error in QEMU. This should be a 0.12 regression as it works
in 0.11.1 and 0.10.6.
- The RTC Alarm failure is confirmed too. Is it unimplemented in QEMU?
- The Base Memory > 640K error seems to be SeaBIOS related. QEMU Bochs
BIOS(tested with both -old-bios hack in 0.12 series and old 0.11.1)
will just freeze after QEMU counted RAM.(Tested with ScriptPC and
Bochs).

> Thnx.
>
> Ciao,
> Gerhard
>
> --
> http://www.wiesinger.com/
>
> Details:
> 1.)
>    NPU Trigonometric Functions.................................FAILED ***
>        Step 1, Expected    0.42926, received    0.42926
>
> Double 'Npu_oldans1' = 0.429259 (3FDB78F91894EFA5h).
> Double 'Npu_oldans2' = 0.628319 (3FE41B2F769CF0E0h).
> Double 'Npu_result ' = 0.429259 (3FDB78F91894EFA6h).
>
> 2.)
> Compare Current Time............................................Passed
>    DOS: 16:24:39.89    Real-Time Clock: 16:24:39.00   (.89 apart)
>
> Compare Current Date............................................Passed
>    DOS: 04/11/2010     Real-Time Clock: 04/11/2010.
>
> Real-Time Clock Alarm...........................................FAILED ***
>
> Compare Elapsed Time............................................Passed
>    DOS: 11.97 Seconds  Real-Time Clock: 12.00 Seconds   (.03 apart)
>
> 3.)     Known Memory:
>        Base        646K   From      0K to    646K   (0000000h to 00A17FFh)
>    Base Memory.................................................FAILED ***
>        ERROR at Address   0A0000h, Bits FEDCBA9876543210
>        ERROR at Address   0A0004h, Bits FEDCBA9876543210
>        ERROR at Address   0A0006h, Bits FEDCBA9876543210
>        ERROR at Address   0A0008h, Bits FEDCBA9876543210
>        ERROR at Address   0A000Ah, Bits FEDCBA9876543210
>        ERROR at Address   0A000Ch, Bits FEDCBA9876543210
>        ERROR at Address   0A000Eh, Bits FEDCBA9876543210
>        ERROR at Address   0A0010h, Bits FEDCBA9876543210
>        ERROR at Address   0A0012h, Bits FEDCBA9876543210
>        ERROR at Address   0A0014h, Bits FEDCBA9876543210
>        ERROR at Address   0A0016h, Bits FEDCBA9876543210
>        ERROR at Address   0A0018h, Bits FEDCBA9876543210
>        ERROR at Address   0A001Ah, Bits FEDCBA9876543210
>        ERROR at Address   0A001Ch, Bits FEDCBA9876543210
>        ERROR at Address   0A001Eh, Bits FEDCBA9876543210
>        ERROR at Address   0A0020h, Bits FEDCBA9876543210
>        ADDITIONAL MEMORY ERRORS WERE NOT LISTED DUE TO LACK OF SPACE.
>
>
>