Early bios call in bootloader cause reboot on skylake x86_64

[kallisti5]

Intel Sky lake Celeron 3855U

AHCI Internal SSD:

options = 0
No APM available.
smp: using ACPI to detect MP configuration
smp: local apic address is 0xfee00000
smp: found local APIC with id 0
smp: found local APIC with id 2
smp: found io APIC with id 2 and address 0xfec00000
VESA version = 3.0, capabilities 1
OEM string: Intel(R) SKL Mobile/Desktop Graphics Chipset Accelerated VGA BIOS
.
.
 0x118: 1024 x 768 x 32 (a = 155, mem = 6, phy = c0000000, p = 1, b = 1)
        mask: r: 8 16 g: 8 8 b: 8 0 dcmi: 0
.
.
Using mode 0x118
VESA compatible graphics!
EDID1: 4f
EDID2: ebx 102
EDID3: 4f
Vendor: ACR
Product ID: 422
Serial #: 571535284
Produced in week/year: 21/2012
EDID version: 1.3
Type: Digital
Size: 51 cm x 29 cm
Gamma=2.2
White (X,Y)=(0.313,0.329)
Supported Future Video Modes:
1280x720@60Hz (id=49281)
1280x960@60Hz (id=16513)
1152x864@75Hz (id=20337)
1280x1024@60Hz (id=32897)
1280x1280@60Hz (id=129)
1920x1080@60Hz (id=49361)
Supported VESA Video Modes:
720x400@70Hz
640x480@60Hz
640x480@67Hz
640x480@72Hz
640x480@75Hz
800x600@56Hz
800x600@60Hz
800x600@72Hz
800x600@75Hz
832x624@75Hz
1024x768@60Hz
1024x768@70Hz
1024x768@75Hz
1280x1024@75Hz
1152x870@75Hz
Additional Video Mode (1920x1080@60Hz):
clock=148.5 MHz
h: (1920, 2008, 2052, 2200)
v: (1080, 1084, 1089, 1125)
size: 51 cm x 28.699 cm
border: 0 cm x 0 cm
Horizontal frequency range = 30..80 kHz
Vertical frequency range = 50..75 Hz
Maximum pixel clock = 160 MHz
Serial Number: LNZ080024237
Monitor Name: Acer S231HL
crtc: h 2008/2052/2200, v 1084/1089/1125, pixel clock 148500000, refresh 6026
Welcome to the Haiku boot loader!
number of drives: 1
add_partitions_for(0x00105360, mountFS = no)
add_partitions_for(fd = 0, mountFS = no)
0x001054c8 Partition::Partition
0x001054c8 Partition::Scan()
check for partitioning_system: GUID Partition Map
<reboot>

[kallisti5]

BIOS reads 512 bytes from 0 (offset = 0), drive 129

After much tracing, the bootloader seems to be hanging up here: ​http://cgit.haiku-os.org/haiku/tree/src/system/boot/platform/bios_ia32/devices.cpp#n546

• is_drive_readable
• drive->ReadAt
• BIOSDrive::ReadAt
• while blocksLeft > 0
  • if fLBA
    • call_bios(0x13, &regs);
      • reboot

So... something is up with: src/system/boot/platform/bios_ia32/bios.cpp