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Bug#1082917: bochsbios: Physical memory read error with BIOS-bochs-latest

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  Bug#1082917: bochsbios: Physical memory read error with BIOS-bochs-latest Arun Mani J <j.arunmani@proton.me> - 2024-09-28 11:10 +0200
    Bug#1082917: bochsbios: Physical memory read error with BIOS-bochs-latest Stephen Kitt <skitt@debian.org> - 2024-10-20 22:00 +0200

#1214504 — Bug#1082917: bochsbios: Physical memory read error with BIOS-bochs-latest

Package: bochsbios
Version: 2.8+dfsg-1
Severity: important
X-Debbugs-Cc: j.arunmani@proton.me

The default BIOS-bochs-latest image shipped with Debian seems to be buggy.
To reproduce:
Try running Bochs with the pre-installed disk images, like this one -
https://bochs.sourceforge.io/guestos/linux-img.tar.gz.

When you do: bochs -f bochsrc and then press C, this is
seen on screen:
bx_dbg_read_linear: physical memory read error (phy=0x0000322f3130, lin=0x00000000322f3130)

To fix it, if we use the BIOS-bochs-legacy image, then it works fine.
Or if we use the BIOS-bochs-latest image found in the upstream's RPM package,
then that also works - https://sourceforge.net/projects/bochs/files/bochs/2.7/.

Encountered this error while trying LittleOS book - https://github.com/OrdoFlammae/littleosbook/discussions/20
Someone else also has faced the issue - https://askubuntu.com/questions/1521719/bochs-cant-access-bootloader-address-0x7c00-error-physical-memory-read-error

Sorry if it is duplicate. Happy to help by providing more details.


-- System Information:
Debian Release: trixie/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.10.9-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=en_IN.UTF-8, LC_CTYPE=en_IN.UTF-8 (charmap=UTF-8), LANGUAGE=en_IN:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

-- no debconf information

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#1217188

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Hi,

On Sat, Sep 28, 2024 at 02:36:08PM +0530, Arun Mani J wrote:
> The default BIOS-bochs-latest image shipped with Debian seems to be buggy.
> To reproduce:
> Try running Bochs with the pre-installed disk images, like this one -
> https://bochs.sourceforge.io/guestos/linux-img.tar.gz.
> 
> When you do: bochs -f bochsrc and then press C, this is
> seen on screen:
> bx_dbg_read_linear: physical memory read error (phy=0x0000322f3130, lin=0x00000000322f3130)
> 
> To fix it, if we use the BIOS-bochs-legacy image, then it works fine.
> Or if we use the BIOS-bochs-latest image found in the upstream's RPM package,
> then that also works - https://sourceforge.net/projects/bochs/files/bochs/2.7/.
> 
> Encountered this error while trying LittleOS book - https://github.com/OrdoFlammae/littleosbook/discussions/20
> Someone else also has faced the issue - https://askubuntu.com/questions/1521719/bochs-cant-access-bootloader-address-0x7c00-error-physical-memory-read-error
> 
> Sorry if it is duplicate. Happy to help by providing more details.

This should now be fixed in testing (in version 2.8+dfsg-2 of the
package).

Would you mind checking that the issue is fixed for you? If it is,
provide the same fix in Debian 12 (which is also affected).

Regards,

Stephen

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