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It's needed to correct the dump and to go further with unpacking the firmware files. As I explained before, NAND Flash memories are unreliable and the probability some bits are flipped is high. In our case, reading the datasheet of the NAND Flash used by the Google Home, the TC58NVG1S3HBAI6 gives the following details about the internal memory organization. Thanks to NandBug, it's now possible to easily dump the entire content of the NAND Flash. However, before even thinking of patching the firmware, making full sense of this dump is needed.
Repeatedly desoldering and soldering back the NAND Flash would have been annoying and could have caused damage to to the PCB. As explained before, the SoC of the Google Home Mini comes without any public documentation. Being able to run custom code on it is valuable to understand it better.
The FT2232H in SPI and Sync FIFO Mode
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Of course, using 2.54mm connectors may cause signal integrity issues when dealing with high speed signals. However, looking at the Flash datasheet, it appears the maximum speed was not that fast, and I chose to take the risk. This is done by using the SPI protocol and a couple of additional GPIOs.
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When not researching and testing computers, game consoles or smartphones, he stays up-to-date on the myriad complex systems that power battery electric vehicles . Google also says that this promo only gives one Home Mini unit per account, and the code covers the cost of the device itself as well as shipping expenses. The contest is open to all Indian citizens who are over 18 years old and have a valid Google account that is more than 30 days old before the start date of the contest. You can enter the game using only one valid Google account.
The Home Mini, on the other hand, has a smaller speaker and lacks the passive radiators. While the Home Mini can still be used to listen to audio content like music and podcasts, it doesn't sound as good. However, even considering this easy access to the entire NAND Flash data, an extended secure boot implementation makes executing arbitrary code using naive methods impossible.
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Given this information, a graphical representation of the binary dumped data can quickly help checking whether the OOB section is likely to be used for storing ECC or not. This bitstream will generate a FSM that's able to erase blocks. The addresses to erase are received from the FT2232H using the Sync FIFO Mode. This bitstream implements a simple FSM that will read all pages of the NAND Flash one by one and stream them to the FT2232H using the Sync FIFO Mode.
In order to mount and eventually alter the content of these partitions, I choose to use the exact same YAFFS2 driver that can be found on Google's shared files. Extracting files from this image is just a matter of running the unsquashfs command. Please note the Kernel version, sources, initramfs and init.rc file will be useful in the second part of this series of article.
For instance, keeping track of the Google Home Mini firmware releases becomes relatively easy. Further, attempting to run arbitrary code on the device from the NAND Flash becomes possible. While all the executable data is apparently verified, having a total control on all the NAND Flash data does open a rather large attack surface. It shouldn't actually have been a real surprise to me, as it was clearly stated in the DEFCON slides I linked to at the very beginning of the article.
Unlike the Home Mini, the Nest Mini comes with a built-in wall mount. It also provides better sound, with improved bass response, although the physical speakers in both devices use 40mm drivers. Since the Google Home Mini has all of the same functionality as the Google Home, it makes a good entry-level smart speaker. Jeremy Laukkonen is automotive and tech writer for numerous major trade publications.
Project purchase includes the delivery kit of complete source code, full document/ report, installation & configuration, project explanation & demo, support. For android projects you will get mobile apk and local apk. As the range of smart devices has been expanding so does the variety of tasks that can be performed with voice commands. The list of things you can do with Google Assistant is so huge that one might not remember them all. From Android, iOS, and Smart TVs to dedicated smart speakers and display devices, Google’s AI-powered voice assistant is everywhere. Google Assistant is the smartest way to control Wi-Fi-connected smart devices and appliances.
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The 60MHz clock is generated by the FT2232H and clock the entire FPGA. The articles highlight that Google has released the source code for the bootloader and Linux Kernel running on the Chromecast. This source code will be extremely useful in the second article of this series.
However, please note that using both the SPI mode and Synchronous FIFO mode of the FT2232H requires adding a EEPROM to the BOM. This EEPROM contains configuration data for the FT2232H and can sometimes be omitted. Just start with “Hey Google” to get answers from your Google Assistant, tackle your day, enjoy music or TV shows, and control your compatible smart home devices. And with Voice Match, the Assistant can tell your voice from others—up to six people can get personal assistance on each device. In terms of functionality, the Home Mini and Nest Mini are identical. They answer all the same queries and commands, and they work with all of the same devices and apps.
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