New subject: Burn 2MB coreboot.rom on 8MB flash chip

3 Oct 2018

      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@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@protonmail.com 
mailto:ce.autom@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@gmail.com <mailto:veredz72@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@protonmail.com <mailto:ce.autom@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@gmx.de <mailto:nico.h@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

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