Startup sound on the 2016 MacBook Pro

While the sound itself has been disabled, I found the iconic chime is still part of the firmware itself (File GUID: 03C70B0D-67E6-5C16-8E57-312DF246A961) as part of the MacBookPro13,1 (and 13,2 or 13,3) firmware. You can find it yourself with the following steps:

  1. Download macOS Sierra Build 16B2657 from the appStore
  2. Right-click on it and select Show Package Content
  3. Open InstallESD.dmg in Contents -> SharedSupport
  4. Go to Packages -> EFIPayloads
  5. Copy MBP131_0205_B02_LOCKED.fd (for the MacBookPro13,1) somewhere on your machine
  6. Launch UEFITool and open the file and click on “Intel Image”.
  7. Search for “03C70B0D-67E6-5C16-8E57-312DF246A961” (GUID)
  8. Double-click a result
  9. Right-click on the Raw section and select “Extract as is” and safe it somewhere
  10. Strip the 1st 4 bytes in hex editor for example (everything before the ‘caff’ identifier)
  11. Rename your file with a ‘.caf’ extension
  12. Play it using Quicktime
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Startup sound preservation

It seems that on its 2016 MacBook Pro’s Apple has deactivated it’s famous startup sound / chime.

This cought my attention and I was interested to find out where this sound is stored (on older Mac’s). As I learned it is (or used to be at least) part of the Macs firmware. While so far I couldn’t find a way to extract the sound from an Intel / EFI based firmware, there seem to be ways to get the sound from PowerPC based Macs.

This is roughly how to do it:

  1. Get a firmware from a PowerPC Mac as these are based on OpenFirmware (not EFI) and thus easier to extract. For example this one from the Xserve G5 XServeFirmwareUpdate.dmg
  2. Open the downloaded DMG file
  3. Look for the file XServeFirmwareUpdate.pkg and show its package contents
  4. In the sub folder named Contents is the file: Archive.pax.gz
  5. Extract Archive.pax.gz (for ex. double click it in finder)
  6. In the extracted folder locate Applications\Utilities\Xserve Firmware-Updater and show its package contents
  7. locate the file Contents\Resources\BootROMFirmware

Well the BootROMFirmware contains the famous startup sound / chime.

The sound chime has a size of 0xE4B4 (58548) bytes and starts at offset  0xC881C (=821276). So we can just use dd in terminal to extract it:

dd if=~/Desktop/BootROMFirmware of=~/Desktop/start-chime.raw bs=1 skip=821276 count=58548

So now you have the extracted raw start-chime of 58,548 bytes file size. It is encoded using Apple’s version (IMA 4:1) of the IMA ADPCM compression format. To play it you would have to mux it into an AIFF file with correct header and chunk data (FORM, COMM, SSND,…) . You can use also ocenaudio to preview the sound (in messy quality).

If someone finds an easy way to play the raw file, just post a comment 🙂

Update: Seems you can convert the raw file on Mac OS 9 and SndSampler 5.4

You need these settings:

  • Sample Bits: 16
  • Channels: Mono
  • Sample Rate: 44,100
  • Compression: IMA 4:1
  • Data Offset: 16 (Sun Audio / Next)

bildschirmfoto-2016-11-03-um-17-12-23

So far I couldn’t get a decent raw sound import on a more current application & platform.

Update 2:

There seems to be a pastebin of the startup sound raw file here.

Its base64 encoded so to decode:

openssl base64 -d -in paste.txt -out snd.raw

Merken

Merken

Warning: 226D2IL3.30

I just updated to the latest Bios (3.30) on my E3C226D2I and since then OSX stops booting at pci configuration begin. Or even with CPU Sensor issues.

OSXeon:UEFIPatch_0.3.8_osx userone$ ./UEFIPatch ../226D2IL3.30
patch: replaced 10 bytes at offset 114Ah 75080FBAE80F89442430 -> EB080FBAE80F89442430
Image patched
OSXeon:UEFIPatch_0.3.8_osx userone$

IMG_9442

EFI Boot ROM and SMC firmware

EFI Boot ROM and SMC firmware are documented here https://github.com/gdbinit/firmware_vault and here https://support.apple.com/en-us/HT201518

I recently discovered MBA41_0077_B12_LOCKED.scap on the EFI partition of my MBA (/EFI/APPLE/FIRMWARE/MBA41_0077_B12_LOCKED.scap)

The header of the file looks interesting.

$IBIOSI$ MBA41.88Z.0077.B12.1506081728 Copyright (c) 2005-2015 Apple Inc. All rights reserved.
Apple ROM Version
Board ID: MBA41
Built by: root@saumon
Date: Mon Jun 8 17:28:51 PDT 2015
Revision: svn 39297 (B&I)
Buildcave ID: 232
ROM Version: 0077_B12

Apples uses all kind of source control tools: git, Subversion (like the group / guy building the firmware above), probably even someone is still using CVS.

All (large) projects are managed using a centralized build system known as B&I (Build & Integration) – that the revision info.