If that isn’t possible, then the fallback is to go into DFU mode and await a connection over USB.Īs with Intel Macs, there’s no accessible record in the log of what has happened during the initial phase of the boot process, as log records only begin with the kernel.
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Booting an M-series Mac thus starts with the immutable Boot ROM in the hardware, whose most important task is to verify the executable for the next stage, then load and run it. In contrast, boot security in Apple silicon Macs aims to provide a verified chain of trust through each step in the boot process to the loading of macOS, that can’t be exploited by malicious components.
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Once a T2 Mac has performed its POST and initialised the SMC, the T2 sub-system establishes the level of Secure Boot in force, and, if that’s Full or Medium Security, boot.efi is checked before being loaded, and that leads through to the rest of the boot process. With two separate processors in each T2 Mac, there are two separate sets of firmware, one EFI and the other known as iBridge or BridgeOS. Maybe Apple silicon Macs do still run POST, but haven’t yet found a good way to report it? To discover whether that’s feasible, you need to compare what happens in their boot sequences. Those are normally retrieved from NVRAM, but as far as I can see, Apple silicon Macs don’t have anywhere in their NVRAM where they might store the result of a POST. While that does report the results of the last Diagnostics test run (if any), for Apple silicon Macs there’s no mention of any POST, as there is on Intel Macs, even those with a T2 chip. The first place to look is where Macs normally report the results of their last POST, in the Diagnostics item of System Information. One catch here is recalling that POST routines may not be run for a restart, as they normally need a ‘cold’ start from the Mac being shut down. So what happens when an Apple silicon Mac fails its POST? Does it even run them? Every model of Mac in the past has had its own POST routines, some that have become famous because of the sounds that result, or what’s displayed, from the sight of a Sad Mac to the sound of a car crash. Tags APFS Apple AppleScript Apple silicon backup Big Sur Blake bug Catalina Consolation Console diagnosis Disk Utility Doré El Capitan extended attributes Finder firmware Gatekeeper Gérôme HFS+ High Sierra history of painting iCloud Impressionism iOS landscape LockRattler log logs M1 Mac Mac history macOS macOS 10.12 macOS 10.13 macOS 10.14 macOS 10.Power-on self-tests (POST) are widely used in electronics, and one of the oldest features of personal computers. I will publish a separate article later tonight detailing the changes that I’ve been able to find in 13.4. IBoot on Apple silicon Macs is updated to version 8422.121.1, and T2 firmware is updated to 1968.120.12.0.0 with iBridge. Fixes for Safari 16.5 are listed here, and include the three WebKit vulnerabilities believed to have been actively exploited. Security fixes for Monterey (total 27) are listed here, and those for Big Sur (total 25) are here. A third WebKit vulnerability has been fixed in 13.4, but not in the RSR, which Apple is aware may have been actively exploited. Those are believed to have been actively exploited, and are included in the fixes for 13.4, together with 47 other vulnerabilities, of which four are in the kernel.
fixes syncing of Screen Time settings across devices.Īpple’s list of security fixes for 13.4 is here, and confirms that two vulnerabilities in WebKit were fixed in RSR (a).fixes a problem with VoiceOver navigating to landmarks on webpages,.
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The Ventura update is around 2.7 GB to download for an Apple silicon Mac, and 1.55 GB for an Intel model.Īmong the fixes and improvements listed by Apple for 13.4 are: Also available for Monterey and Big Sur is Safari 16.5. Apple has just released the update to bring macOS 13 Ventura to version 13.4 (build 22F66), and security updates to bring Monterey to 12.6.6 and Big Sur to 11.7.7.
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