[U-Boot] u-boot: x86: interrupt mapping

Jian Luo
2016-07-20T09:12:55Z

Hi Christian,

On 20.07.2016 10:22, Christian Gmeiner wrote:
> Hi Jian,
>
>> I took some time to recall what I did by patching FSP:
>>
>> - search in every PE32 and TE image section for binary sequence
>> 81c9000100008908c6460e01
>> and change to
>> 81c9000102008908c6460e00
>>
> In the meantime I started by patching out every access to the uart bar, with
> the same result as I get with your patching strategy.
>
>> - then replace them in-place
>>
> So here is the next interesting problem. During fsp_init it looks like
> fsp copies itself
> to ram (IP 0xFFFD1C6C vs 0x3F5F64E1) and here it does a busy loop :(
I don't think it's a busy loop. This Bug?:
https://patchwork.ozlabs.org/patch/446555/

>
> At what place do you do the in-place patching? I hoped to do it at
> init_board setup.
I mean in UEFITool select the "PE32 image section", right click "Extract
body", do binary patching using your favorite hex editor, right click
"Replace body".
>> The difference can be better understand if disassemblies are compared, eg:
>> Disassembly of section .data:
>> @@ -3367,9 +3367,9 @@
>> 25fc: 05 00 05 00 00 add $0x500,%eax
>> 2601: 8b 08 mov (%eax),%ecx
>> 2603: 81 e1 ff ff f8 ff and $0xfff8ffff,%ecx
>> - 2609: 81 c9 00 01 00 00 or $0x100,%ecx
>> + 2609: 81 c9 00 01 02 00 or $0x20100,%ecx
>> What I did here is setting BAUDSEL to SYS_25MHz.
>>
>> 260f: 89 08 mov %ecx,(%eax)
>> - 2611: c6 46 0e 01 movb $0x1,0xe(%esi)
>> + 2611: c6 46 0e 00 movb $0x0,0xe(%esi)
>> Can't recall why I did this, maybe bypassing PLL altogether?
>>
>> 2615: c6 46 0f 00 movb $0x0,0xf(%esi)
>> 2619: c6 46 03 83 movb $0x83,0x3(%esi)
>> 261d: c6 46 01 00 movb $0x0,0x1(%esi)
>>
>> Since I don't rely on Topcliff UART for output, the baud rate recalculation
>> is all skipped.
>>
> The same here... I am using a pci fpga based uart.
Maybe you can try the fsp.bin I sent, to see if it runs
>
Since it's a bit off-topic, should we exchange information w/o ccing the
list?

Best regards,

*Jian Luo
DC-IA/EAH2*

Tel. +49(9352)18-4266

*Be**QIK
*