SDRAM initialization

I'm writing a new bios for an x86 processor
with an integral SDRAM controller. I have
it working with the SDRAM, but I'm troubled
by a specification in the SDRAM data*** that
requires a precharge of all banks to be issued
upon powerup.

As far as I can see, there is no way to run
a specific SDRAM "command". Will a write to
all banks accomplish the precharge?


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