3 ms·
Huh. I almost missed that, but can confirm. On a past project we had two DDR RAMs and a NOR Flash on the same bus. There was one hardware engineer, and he laid
by ianhowson 6y ago
Huh. I almost missed that, but can confirm.
On a past project we had two DDR RAMs and a NOR Flash on the same bus. There was one hardware engineer, and he laid out the memory subsystem in about a day. (The power supplies were dramatically more complicated.)
It almost worked first time. I noticed about one memory error per day per device, which I repro'd with repeated `md5sum /tmp/largefile`.
We just dropped the clock rate in U-Boot.
Failed devices? Heat it up with a hot air gun for a while. Fixed 90% of them. Still doesn't work? Throw it away.
There are no mysteries, just stuff you don't know yet.