[coreboot] Burn 2MB coreboot.rom on 8MB flash chip

[Jose Trujillo]

Thank you Mariusz.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, October 3, 2018 12:46 PM, Mariusz Szafrański via coreboot <coreboot at coreboot.org> wrote:

> Hi Jose,
>
> In your case set:
> ROM chip size = 8MB (your case)
> CBFS_SIZE <= 5MB (your specific case)
>
> This will build 8M file. After that just cut last 5M of this 8M file (using any hexeditor) or use something like below from command line:
>
> dd if=coreboot.rom of=corebootout.rom bs=1M skip=3
>
> (before doing that double check if original vendor`s rom file size is 5242880 bytes long)
>
> Mariusz
>
> W dniu 03.10.2018 o 08:53, Jose Trujillo via coreboot pisze:
>
>> You can do that but I have never done this way and I cannot help you with that.
>>
>> Someone else can advise on this?
>>
>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>> On Tuesday, October 2, 2018 9:39 PM, Zvi Vered [<veredz72 at gmail.com>](mailto:veredz72 at gmail.com) wrote:
>>
>>> Hi Jose, All,
>>>
>>> Highly appreciate your answers.
>>> It seems the vital information in your replies are not documented.
>>>
>>> The original vendor's rom file size is 5MB.
>>> Do you think I can create a 5MB coreboot.rom ?
>>>
>>> It seems that AfuEfix64.efi supplied by vendor is looking for 5MB rom file like the original one. For any other file size, AfuEfix64 fails.
>>>
>>> Thank you,
>>> Zvika
>>>
>>> On Mon, Oct 1, 2018 at 2:08 PM Jose Trujillo <ce.autom at protonmail.com> wrote:
>>>
>>>> Zvika:
>>>>
>>>> There are 2 ways to build coreboot: (choose one)....
>>>> 1.- Including IFD, TXE, GBE etc.... inside coreboot CBFS.
>>>> 2.- Using the original firmware(FW) with IFD, TXE, GBE already in flash and just rewrite coreboot on top of the BIOS block.
>>>>
>>>> Your original computer Firmware = Intel FW + "BIOS"
>>>>
>>>> Intel FW = IFD +PD+ME/TXE+GBE
>>>> BIOS=AMI-Phoenix etc...
>>>>
>>>> IFD=Intel Firmware Descriptor Table.
>>>> PD=Parameters
>>>> ME=Management Engine (For "Core" kind of processors).
>>>> TXE=Trusted Execution Engine (For "Atom" kind of processors).
>>>> GBE=Network card firmware.
>>>>
>>>> Zvika said:
>>>> "After creating coreboot.rom should I always use the original BIOS with ifdtool to convert rom to bin ?"
>>>> Answer:
>>>> No, there are other methods and tools that can do the merge.... (ifdtool and Intel's FIT are working fine for me)
>>>>
>>>> After the creation of the coreboot build you have 2 ways of doing the flashing for your case: (with fpt).
>>>> 1.- Flash the full 8MB (Intel FW+coreboot) if the SPI flash is blank or have unknown firmware.
>>>>      Use IFDTool in this case to inject coreboot to Intel FW..... then flash it with fpt .
>>>> 2.- Flash only the BIOS block (5MB your specific case) in this case ask someone else how to do it with fpt....
>>>>
>>>> I hope this answered your questions.
>>>> Jose..
>>>>
>>>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>>>> On Saturday, September 29, 2018 12:24 AM, Zvi Vered <veredz72 at gmail.com> wrote:
>>>>
>>>>> Hi Jose,
>>>>>
>>>>> You wrote:
>>>>> "My recommended approach is using the original Intel FW with already included the FD, TXE".
>>>>>
>>>>> What is "original intel FW" ?
>>>>> What is FD, TXE ?
>>>>>
>>>>> After creating coreboot.rom should I always use the original BIOS with ifdtool to convert rom to bin ?
>>>>>
>>>>> Thank you,
>>>>> Zvika
>>>>>
>>>>> On Wed, Sep 26, 2018 at 7:27 PM Jose Trujillo <ce.autom at protonmail.com> wrote:
>>>>>
>>>>>> You are right Nico,
>>>>>>
>>>>>> I just forgot the troubles this caused me.
>>>>>> I am sorry Vika... My mistake.
>>>>>>
>>>>>> I can confirm with Nico:
>>>>>> ROM chip size = 8MB (your case)
>>>>>> CBFS_SIZE = 2 to 5MB (your specific case)
>>>>>>
>>>>>> My recommended approach is using the original Intel FW with already included the FD, TXE.
>>>>>>
>>>>>> I never tested adding regions to coreboot but you can try.
>>>>>>
>>>>>> To have better chances of success you should be dumping hardware settings booting with your original "BIOS" (look for the attached file).
>>>>>>
>>>>>> Check if the system is "Memory down"or/and ECC because it will be needed to edit FSP (if using it).
>>>>>> Dump memory settings with the following commands:
>>>>>>
>>>>>> sudo dnf install i2c-tools-perl
>>>>>> sudo modprobe eeprom
>>>>>> decode-dimms
>>>>>>
>>>>>> If you have not done this already there is still a long way to go.
>>>>>> Don't get intimidated, just do it, if you have questions just ask.... I will try to help
>>>>>>
>>>>>> Good luck,
>>>>>> Jose.
>>>>>>
>>>>>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>>>>>> On Wednesday, September 26, 2018 6:28 PM, Nico Huber <nico.h at gmx.de> wrote:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> On 9/26/18 9:19 AM, Jose Trujillo via coreboot wrote:
>>>>>>>
>>>>>>> > No, don't change it, you change the size of coreboot only if during the
>>>>>>> > building process "make" complain that there is not enough space but in
>>>>>>> > your case your build was already successful leave it like that.
>>>>>>>
>>>>>>> this advice seems very weird to me. I'm not experienced with Bay Trail.
>>>>>>> But unless there is a bug in the Bay Trail code, you should always set
>>>>>>> the correct ROM_SIZE (to the full flash chip size). Otherwise you may
>>>>>>> introduce bugs in code that relies on this setting (e.g. saving the
>>>>>>> MRC cache might fail and so would S3 resume).
>>>>>>>
>>>>>>> CBFS_SIZE however is the setting to adjust according to your needs. It
>>>>>>> should be at most the size of the BIOS region.
>>>>>>>
>>>>>>> > In the rare circumstance that more space is required you can increase
>>>>>>> > coreboot size to 4MB and istill will fit into your system 5MB of space
>>>>>>> > available.
>>>>>>> > "ifdtool" will inject coreboot in the top of the BYT_orig.bin and save
>>>>>>> > as BYT_orig.bin.new that you can flash to your system.
>>>>>>>
>>>>>>> I assume this doesn't work oob if you set ROM_SIZE correctly. But it is
>>>>>>> unnecessary to craft a single file by hand. You can either only flash
>>>>>>> the BIOS region (recommended) or add the other regions in coreboot's
>>>>>>> config (HAVE_{IFD,ME,GBE}_BIN).
>>>>>>>
>>>>>>> Nico
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