Hello,
Purpose:
Get the output sent through int10h on an external serial link mapped on
MEM space (PCIe board with OxPCIe952 from Startech).
Hardware:
Mohon Peak CRB with coreboot. PCIe board with OxPCIe952 from Startech.
Bootable hard disk with GRUB and Linux.
Code flow: (from my understanding)
<...>
./src/post.c: mainint()
|--> interactive_bootmenu()
| |--> "Press ESC for
boot menu." (sent through INT10h calls)
|
|--> startBoot()
|--> "Jump to int19"
|--> Call INT19h
<INT19h handler>
./src/boot.c: do_boot()
|--> "Booting from Hard Disk..." (sent
through INT10h calls)
|--> boot_disk()
|--> Call INT13h
<...>
What works:
Modified seabios to initialize PCIe board OxPCIe952.
- Add field at the end of BDA to store the u32 base address of the
additional UART ports.
- Init the bridge after pci_probe().
- Store the base address of the additional UART ports during serial_setup().
Using sgabios with output set to 0x2f8 (uart1) works flawlessly.
- All (dprintf-based) messages are sent on second UART port of the Mohon
Peak.
- All (printf-based, INT10h) messages are also displayed on second UART
port of the Mohon Peak.
- System boots.
What almost works:
Modified sgabios to display INT10h calls on MEM mapped UART port.
- All (dprintf-based) messages are still sent on second UART port of the
Mohon Peak.
- Display of "Press ESC for boot menu." on OxPCIe952 : OK (any previous
INT10h-based messages also displayed on OxPCIe952).
- After call of INT19h, "Booting from Hard Disk..." is not displayed on
OxPCIe952.
- Mohon Peak remains in POST code F8h (like as for waiting a selection
in the GRUB menu).
Note: reducing debug level (20 -> 2) of int10h shows that the
int10h-handler is called with the messages to be displayed, but nothing
appears on OxPCIe952 side.
What could be the reason of this behavior ?
Any switch between 16-bit and 32-bit code execution ?
Any suggestion is welcome.
Regards,
Patrick Agrain
_______________________________________________
SeaBIOS mailing list
[email protected]
http://www.seabios.org/mailman/listinfo/seabios
