SamuelDeleglise
commented
7 years ago I finally figured out how to flash the bootable sd card from the files...
The procedure is the following:
- I open my ubuntu virtualbox on my laptop with integrated SD card reader.
- To make sure the SD card will be visible in the virtualbox, I go to configuration/usb and enable the sd card reader (which appears there on my windows system)
- I open the ubuntu virtual machine and install gparted and dosfstools with the command "sudo apt-get install XXX"
- I insert the sd card in the reader and launch gparted (sudo gparted /dev/sdb) on the corresponding device (/dev/sdb in this case but can be found with "dmesg | tail")
- In the gparted interface, delete all existing partitions, create a partition map if there is not already one, then create 1 fat32 partition with the maximum space available. To execute these operations, it is necessary to unmount the corresponding partitions (can be done within gparted)
- Once formatted, right click to set the flag "boot" to that partition !!!!!
- Close gparted, remount the sd card (by simply unplugging/replugging it), and copy all files at the root of the sd card (normally mounted somewhere in /media/xxxx)
---> Eject the card, that should be fine.
Now that I coud apply this procedure on a 4 GB SD card, I have been able to make a 4 GB image of it (which hopefully includes the right boot flag) using win32diskImager (in /leon/omq/software/redpitaya/image for sd card/redpitaya_v0.92.img) In principle, it is only necessary to do a win32diskimager write operation using this file on any sd card that is larger or equal to 4GB
I have been struggling all the afternoon with SD cards. The aim was to make a backup .img file of the system v0.92 , because it cannot become corrupted unlike the subsequent ubuntu-based systems.
Problem: it is impossible to find an img file of such an old system on the web (or at least I didn't find one yet), but we have some 32 GB bootable SD cards with the system on it.
I could successfully make an image of one of these cards using win32imager (on leon/software/redpitaya/image for sd cards/sheon_os0.92.img), but it is more than 30 GB of void... --> it can be flashed on a 32 GB SD card, and then the system works fine --> Unfortunately, it cannot be flashed onto a smaller SD card.
I tried two things to reduce the file size :
This sounds like a silly problem, basically, whenever you copy the system onto a card, there is no way to use this as a copy to be flashed on a smaller card, or at least, not with the rudimentary win32diskimager that we are using... I will try to look a bit more through the internet for a reasonable sized image of the v92 system.