[linux-cirrus] Display flicker when using Ethernet (known problem) or SRAM (new)

Anybody remember our "Display flickers when Ethernet traffic" problem?

It's still there and we've got another thing that triggers it.

As soon as SRAM is used [1] Display will flicker (and it will be worse than
what we saw with ethernet)

[1]

Kernel config

#make menuconfig (in MTD)
#Memory Technology Devices (MTD)  --->  Self-contained MTD device drivers
    <*> Uncached system RAM
    <*> Physical system RAM
    <*> Test driver using RAM
    (512) MTDRAM device size in KiB
    (1)   MTDRAM erase block size in KiB
    (0x20000000) SRAM Hexadecimal Absolute position or 0

#Userspace example that triggers the problem

dd if=/dev/zero of=/dev/mdt0

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