if i remember right. it boots from SD card if its there then defaults to
Emmc
it was changed a long time ago to not need a boot button
On 5/16/2021 10:59 AM, John Dammeyer wrote:
I just looked at one of the photos of the BB AI and I don't see a boot
button. So ignore my last posting.
If you install an sd card how does it know what to boot from?Would it
default to the sd image?And if the /boot/uEnv.txt has the write to
flash set at the end wouldn't it just automatically then write the
image to eMMC?
Theoretically the BBB always boots to eMMC and the Boot button is
required.But I recall at some point also running the BBB where it
booted automatically to the sd card image.But I don't remember how it
did that without the Boot button.Is there an EEROM location that has
been corrupted on the BB AI?
John
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Kenneth Martin
*Sent:* May-16-21 10:18 AM
*To:* Beagle Board
*Subject:* Re: [beagleboard] Unable to boot from SD card or mount a
blank one
Have you tried the lsscsi and lsblk commands to see what the system
thinks that device is?
On Sun, May 16, 2021, 12:49 PM John Dammeyer <[email protected]
<mailto:[email protected]>> wrote:
If it's like the Beaglebone Black, when you apply power, you have
to hold the boot button down for quite a while. That's what
tells the system to boot from the sd card.
It won't matter if you form the card as Balena etcher will write
the image in the format required for the Beagle.
John
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of *Shrikumar Sharma
*Sent:* May-16-21 4:52 AM
*To:* BeagleBoard
*Subject:* [beagleboard] Unable to boot from SD card or mount a
blank one
Hi
I am new to the BB AI. I have been facing some issues with the
SD-card boot.
The board boots just fine off of the eMMC. However, I would like
to boot it from the SD card.
I have used a number of images from the BB images page, written
them into the SD card with Balena etcher, no use - the board
always boots off of the eMMC.
I then tried formatting the card with FAT32 , allocation unit size
4096, and then checked if I could at least mount it from the eMMC
booted system. The SD card is never recognized and there is no
entry in /dev for this device.
I tried using dtc on the am5729-beagleboardai.dtb to generate the
dts, followed the post at:
https://www.element14.com/community/thread/74281/l/beaglebone-ai-booting-from-sd-card-issue
<https://www.element14.com/community/thread/74281/l/beaglebone-ai-booting-from-sd-card-issue>
specifically, I did this:
"/converted the am5729-beagleboneai.dtb to xx.dts using "dtc".
Then, I found out mmc1 node (mmc@4809c000), and modify some places
as follows:/
/1. compatible = "ti,dra7-sdhci"; >>>>> compatible =
"ti,dra7-sdhci", "ti,omap4-hsmmc";/
/2. add: vmmc_aux-supply = <0xd0>; (same node with vqmmc-supply)/
/3. max-frequency = <0xb71b000>; >>>>> max-frequency =
<0x16e3600>; (to lower the frequency of mmc)/
//
/Save and exit, then convert the .dts file to
am5729-beagleboneai.dtb, replace the old one./
"
(copied the steps from the above site)
This does not work either.
I dont have a serial interface for the board just yet so I dont
have the serial output.
I would appreciate any input or help. I am not sure what I should
do to get this board booting off of the SD card.
Thank you and Best regards!
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