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strace merely tells you what eips does (in terms of the kernel/userland API). You need to write your own code, that's for sure. But there are (lots!) of working code to trigger eink refreshes. Every native application published here in this forum has such code. Remember that the API changed between K3 and K4 (slightly, einkfb.h) and K5/KPW/KPW2 (a lot, mxcfb.h). Basically, it's a single ioctl, with a properly filled struct specifying the region to refresh.
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