[FS#285] Kernel panic on ebox-3300 (Vortex86DX CPU)

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Shang Jia (zhoushiyi213) 

Attached to Project - LEDE Project
Summary - Kernel panic on ebox-3300 (Vortex86DX CPU)
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - The firmware (Reboot, HEAD r2115) failed to boot on the x86 hardware of ebox3300a (http://www.compactpc.com.tw/product.aspx?act=detail&id=16). The CPU does not support PAE so I used legacy profile to compile. The boot log says that the CPU supports x2apic (really? Also no such option in BIOS) but the kernel does not:

[    0.000000] Checking if this processor honours the WP bit even in supervisor mode... Ok.
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS:2304 nr_irqs:32 16
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [ttyS0] enabled
[    0.000000] tsc: Fast TSC calibration using PIT
[    0.000000] tsc: Detected 933.313 MHz processor
[    0.010013] Calibrating delay loop (skipped), value calculated using timer frequency.. 1866.62 BogoMIPS (lpj=9333130)
[    0.010543] pid_max: default: 32768 minimum: 301
[    0.011016] Mound-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.011336] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.013527] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.013805] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
[    0.014084] CPU: Vortex86 SoC 05/02 (family: 0x5, model: 0x2, stepping: 0x2)
[    0.020554] Performance Events: no PMU driver, software events only.
[    0.020923] Kernel panic - not syncing: BIOS has enabled x2apic but kernel doesn't support s2apic, please disable x2apic in BIOS.
[    0.020923]
[    0.021544] Rebooting in 1 seconds..

In contrast, the machine boots well with openwrt Chaos Calmer 15.05.1 x86 generic (without IDE controller driver, though), and it also works well with the kernel from Debian sid installation iso.

Besides, there are patches that fixes its IDE controller detection as well as ethernet adapter (https://lists.openwrt.org/pipermail/openwrt-devel/2014-October/028981.html and https://lists.openwrt.org/pipermail/openwrt-devel/2014-October/028983.html). Since there is not supposed to be too many specific profiles, should we adopt these patches?

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=285