[coreboot] Mohon Peak, Memtest86+ does not start

[Kuzmichev Viktor]

Hello Stefan,

Thank you for the tip, I'm currently looking into that. But I'm still 
not sure how to specify the load address. My guess is that I should edit 
the linking script properly to do it. By default it looks as follows 
(memtest.lds):

OUTPUT_FORMAT("elf32-i386");
OUTPUT_ARCH(i386);

ENTRY(_start);
SECTIONS {
     . = 0x10000;
     _start = . ;
     .data : {
         *(.data)
     }
}

And here is the output of 'readelf -a memtest' command:

ELF Header:
   Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
   Class:                             ELF32
   Data:                              2's complement, little endian
   Version:                           1 (current)
   OS/ABI:                            UNIX - System V
   ABI Version:                       0
   Type:                              EXEC (Executable file)
   Machine:                           Intel 80386
   Version:                           0x1
   Entry point address:               0x10000
   Start of program headers:          52 (bytes into file)
   Start of section headers:          239496 (bytes into file)
   Flags:                             0x0
   Size of this header:               52 (bytes)
   Size of program headers:           32 (bytes)
   Number of program headers:         1
   Size of section headers:           40 (bytes)
   Number of section headers:         3
   Section header string table index: 2

Section Headers:
   [Nr] Name              Type            Addr     Off    Size   ES Flg 
Lk Inf Al
   [ 0]                   NULL            00000000 000000 000000 00      
0   0  0
   [ 1] .data             PROGBITS        00010000 010000 02a774 00 WA  
0   0  1
   [ 2] .shstrtab         STRTAB          00000000 03a774 000011 00      
0   0  1
Key to Flags:
   W (write), A (alloc), X (execute), M (merge), S (strings)
   I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)
   O (extra OS processing required) o (OS specific), p (processor specific)

There are no section groups in this file.

Program Headers:
   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
   LOAD           0x000000 0x00000000 0x00000000 0x3a774 0x3a774 RW 
0x200000

  Section to Segment mapping:
   Segment Sections...
    00     .data

There is no dynamic section in this file.

There are no relocations in this file.

The decoding of unwind sections for machine type Intel 80386 is not 
currently supported.

No version information found in this file.

So, the entry point is at the offset of 0x10000. But I think I should 
somehow change the 'VirtAddr'. I've tried to edit the script in 
different ways, for example, I've tried to add MEMORY command and then 
allocate certain sections to the regions as explained here:
https://sourceware.org/binutils/docs/ld/REGION_005fALIAS.html#REGION_005fALIAS 

but haven't come to any success yet.

Are there any advices you could give me?  Am I even looking in the right 
direction?

Thanks in advance,
Viktor

On 20.01.2015 22:33, Stefan Reinauer wrote:
> * Kuzmichev Viktor <kuzmichevviktorv at gmail.com> [150120 14:31]:
>> Hello,
>>
>> I'm trying to load Memtest86+ on the Mohon Peak reference board from
>> CBFS and it fails.
>> My primary payload is SeaBIOS. Memtest is added using cbfstool, so
>> the layout of my ROM file is as follows:
>>
>> $ ./build/cbfstool build/coreboot.rom print
>> coreboot.rom: 8192 kB, bootblocksize 1024, romsize 8388608, offset 0x600000
>> alignment: 64 bytes, architecture: x86
>>
>> Name                           Offset     Type         Size
>> cmos_layout.bin                0x600000   cmos_layout  1352
>> fallback/romstage              0x600580   stage        26616
>> fallback/ramstage              0x606dc0   stage        60446
>> fallback/payload               0x615a40   payload      55799
>> config                         0x623480   raw          4323
>> revision                       0x6245c0   raw          714
>> img/Memtest86+                 0x6248c0   payload      225028
>> (empty)                        0x65b800   null         1001368
>> mrc.cache                      0x74ffc0   (unknown)    65536
>> cpu_microcode_blob.bin         0x760000   microcode    83968
>> (empty)                        0x774840   null         46936
>> fsp.bin                        0x77ffc0   (unknown)    372736
>> (empty)                        0x7db000   null         150424
>>
>> I've tried versions 4.20 and 5.01. Memtest86+ v4.20 just hangs, here
>> is output of SeaBIOS trying to load it:
>> Trying CBFS
>> Booting from CBFS...
>> Run img/Memtest86+
>> Segment 41544144 194420 at 0xffe24920 -> 194420 at 0x00000000
>> No compression
>>
>> And then nothing. Memtest86+ v5.01 goes a bit further, SeaBIOS finds
>> its entry point:
>> Trying CBFS
>> Booting from CBFS...
>> Run img/Memtest86+
>> Segment 41544144 224972 at 0xffe24920 -> 224972 at 0x00000000
>> No compression
>> Calling addr 0x00010000
> It looks like in both cases memtest86+ is loaded at address 0x00000000
> which will overwrite a bunch of memory, including the coreboot tables.
> Looks like the memtest86+ elf binary needs to specify a load address.
>
> Stefan
>