Alexander Boettcher wrote:
Hello,
On 07.03.19 23:10, Valery V. Sedletski via users wrote:
Hi, Genodians!
Some days ago, I ordered a Thinkpad T420, which is listed in Genode
unofficial HCL by cnuke. I set up Genode booting remotely via PXE+Intel
AMT. It boots the system image (x86_32 arch) just fine on real
hardware. But if I try booting an x86_64 image, it reboots on most
kernels, or traps on Fiasco.OC. Last messages in the log I see are from
"bender" [1]. This is when booting using NOVA kernel. If I try Fiasco.OC
as a kernel ([2]), It goes until "bootstrap", and last I see in the log
are "bootstrap" messages, until it attempts to start the kernel. And at
the same time, I see the following trap screen from bootstrap: [3]. All
registers are zeroes, except a few ones. So, with "foc" kernel, I see a
Trap #0 (division by zero). In case of "NOVA" and "base-hw" kernel, it
does not trap, but just reboots. I tried to remove the "novga" parameter
from NOVA kernel, but I still see a blank screen.
I could reproduce it after same configuration changes in the UEFI BIOS
of my test T420. When I set in the UEFI/BIOS the option "Security ->
Memory Protection -> Execution Prevention" to disabled, the machine
reboots.
For my T420 test machine it is set to enabled, and then it works, log
attached.
Hope it helps,
Yes, that helps. I had "Execution prevention" disabled too. I thought
that it may cause problems if enabled, but it is vice versa. So, I
enabled it again. In case of NOVA and Fiasco.OC kernels, it boots now
fine with "Execution prevention" enabled. With "hw" kernel, it now stops
after bender's messages, instead of a reboot, though. I'm sorry that I
didn't tried with "Execution prevention" enabled, before posting the
message. Didn't wanted to disturb you with no reason
P.S.: I wondered why 32-bit works fine, but cnuke on the irc channel
supposed that it could be because of NX bit, which is enabled on 32-bit
normally only if PAE is enabled.
WBR,
valery
Alex.
...
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