Messages in this thread | | | Subject | Re: Bug report: A commit about serial8250 cause the output disorderly at the phase of startup | From | "Hongzhi, Song" <> | Date | Mon, 22 Apr 2019 09:12:38 +0800 |
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Hi all,
Anyone notice this issue?
--Hongzhi
On 4/19/19 10:24 AM, Hongzhi, Song wrote: > 1. Issue description: > > Boot kernel( >= linux-rt-devel-v5.0.3 ) with qemu. > Then qemu will print following disorderly messages. > > At the beginning, the messages are disorderly. But then it becomes > normally from printing "[ 0.000000] 000: Linux version..." > > -------------------------------------------------- > [ 0.019000] 000: tsc: Unable to calibrate against PIT > [ 0.002583] 000: 6199.83 BogoMIPS (lpj=3099918) > [ 0.521247] 000: Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz > [ 0.521247] 000: (family: 0x6, model: 0xf > [ 0.521247] 000: , stepping: 0xb) > [ 0.533126] 000: unsupported p6 CPU model 15 > [ 0.533318] 000: no PMU driver, software events only. > [ 0.765082] 000: 1 ACPI AML tables successfully acquired and loaded > [ 0.765274] 000: > [ 0.785903] 000: Enabled 2 GPEs in block 00 to 0F > [ 0.786128] 000: > [ 0.835675] 000: acpi PNP0A03:00: fail to add MMCONFIG information, > can't access extended PCI configuration space under this bridge. > [ 0.892056] 000: 5 > [ 0.892289] 000: *10 > [ 0.892416] 000: 11 > [ 0.892527] 000: ) > [ 0.892661] 000: > > /* skip some repeated contents */ > > [ 5.052149] 000: , 512kB Cache > [ 0.000000] 000: Linux version 5.0.3-yocto-preempt-rt+ > (hsong@pek-lpggp1) (gcc version 8.3.0 (GCC)) #24 SMP PREEMPT Thu Apr > 18 03:29:58 EDT 2019 > [ 0.000000] 000: Command line: root=/dev/vda rw highres=off > console=ttyS0 mem=256M ip=192.168.7.4::192.168.7.3:255.255.255.0 vga=0 > uvesafb.mode_opti0 > [ 0.000000] 000: x86/fpu: x87 FPU will use FXSAVE > [ 0.000000] 000: BIOS-provided physical RAM map: > [ 0.000000] 000: BIOS-e820: [mem > 0x0000000000000000-0x000000000009fbff] > [ 0.000000] 000: BIOS-e820: [mem > 0x000000000009fc00-0x000000000009ffff] > [ 0.000000] 000: BIOS-e820: [mem > 0x00000000000f0000-0x00000000000fffff] > [ 0.000000] 000: BIOS-e820: [mem > 0x0000000000100000-0x000000000ffdbfff] > > -------------------------------------------------- > > 2. Reproduce: > (1)build kernel: (Attachment is my .config) > make ARCH=x86_64 > CROSS_COMPILE=[path-to-my-cross-toolchain]/x86_64-wrs-linux- > > (2)boot kernel with qemu: > > qemu-system-x86_64 \ > -drive file=qemux86-64.rootfs.ext4,if=virtio,format=raw \ > -nographic \ > -kernel arch/x86/boot/bzImage \ > -append 'root=/dev/vda rw highres=off console=ttyS0 mem=256M ip=dhcp' > > 3. Analysis: > I find the following commit from >=linux-rt-devel-v5.0.3. cause the > issue. > > b9d460e serial: 8250: implement write_atomic >
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