lingon
Posts: 157
Joined: Fri Aug 26, 2011 7:31 am

EMMC card?

Tue Jan 07, 2020 8:35 pm

The Raspberry Pi4 bootloader EEPROM release notes at https://github.com/raspberrypi/rpi-eepr ... e-notes.md has a line which reads for the version 2019-11-18 - Git b6a7593d6 (BETA) RC1:
* Enable high-speed mode for EMMC cards.
Where in a Raspberry Pi can an EMMC card be found?

trejan
Posts: 1874
Joined: Tue Jul 02, 2019 2:28 pm

Re: EMMC card?

Tue Jan 07, 2020 8:42 pm

lingon wrote:
Tue Jan 07, 2020 8:35 pm
Where in a Raspberry Pi can an EMMC card be found?
Compute Modules and eMMC adapters like this. The changes are likely to be related to this issue.

beta-tester
Posts: 1373
Joined: Fri Jan 04, 2013 1:57 pm
Location: de_DE

Re: EMMC card?

Wed Jan 08, 2020 5:52 am

trejan wrote:
Tue Jan 07, 2020 8:42 pm
related to this issue.
simply out of curiosity... was the communication/command sequence between RPi & SD/eMMC captured by electrical probing
or can i capture those sequences by using a linux command?
{ I only give negative feedback }
RPi B (256MB), B (512MB), B+, ZeroW; 2B; 3B, 3B+; 4B (4GB)

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rpdom
Posts: 17029
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: EMMC card?

Wed Jan 08, 2020 7:30 am

beta-tester wrote:
Wed Jan 08, 2020 5:52 am
simply out of curiosity... was the communication/command sequence between RPi & SD/eMMC captured by electrical probing
or can i capture those sequences by using a linux command?
That's stated in the bug report
I used a SparkFun microSD Sniffer and a logic analyzer to observe the communication between Raspberry Pi and the emulated SD card.
Unreadable squiggle

beta-tester
Posts: 1373
Joined: Fri Jan 04, 2013 1:57 pm
Location: de_DE

Re: EMMC card?

Wed Jan 08, 2020 10:19 am

oops... :oops:
i think i really need reading glasses... :shock: :geek:
{ I only give negative feedback }
RPi B (256MB), B (512MB), B+, ZeroW; 2B; 3B, 3B+; 4B (4GB)

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