Is there a way to do complete memory test on android device RAM?
I'm developing a driver but at ramdom times I get certain physical addresses with wrong value causing the driver to go into wrong state. I'm trying to read from RAM when I hit the problem. I Think certain portions of ram on my device are corrupted.
Das U-Boot is perhaps the most widely used boot loader on ARM boards, and it includes some memory test features.
Interestingly, its README suggests an alternative approach that might be more portable and/or more effective:
The best known test case to stress a system like that is to boot Linux with root file system mounted over NFS, and then build some larger software package natively (say, compile a Linux kernel on the system) - this will cause enough context switches, network traffic (and thus DMA transfers from the network controller), varying RAM use, etc. to trigger any weak spots in this area.
While you're building the linux kernel, you might be interested in the CONFIG_MEMTEST=y option, which causes the built-in memory test to be built. This used to be for x86 architecture only, but I believe recent versions support it on other architectures as well, perhaps even ARM.
The memtester tool is already built and available in some linux distributions, for various architectures, including ARM.
The kernel-memtest project might interest you as well.
Bear in mind that no tool can test the memory that it's running from (so a program in a running OS will have significant blind spots) and basic read/write tests won't reveal every type of defect or other error. Set your expectations accordingly, and if you have reason to suspect bad memory, consider trying several different test tools.
As of Feb 2021 there is an ARM based version of MemTest86. It is in the same package as the x86 disk image.
You need a machine with UEFI BIOS however to boot it. So it will be OK on most desktop and server grade machines, but not on smaller ARM based devices that have no built in BIOS.
