Commit Graph

3 Commits (4eae29801b823fde65df38576a90be0abb89e782)

Author SHA1 Message Date
Anton Blanchard ab86b58d95 Exit cleanly from testbench on success
Signed-off-by: Anton Blanchard <>
4 years ago
Benjamin Herrenschmidt 3b603402d2 soc_reset: Use counters, add synchronizers
In some cases we need to keep the reset held for much longer,
so use counters rather than shift registers.

Additionally, some signals such as ext_rst and pll_locked
or signals going from the ext_clk domain to the pll_clk
domain need to be treated as async, and testing them without
synchronizers is asking for trouble.

Finally, make the external reset also reset the PLL.

Signed-off-by: Benjamin Herrenschmidt <>
4 years ago
Anton Blanchard 03fd06deaf Rework SOC reset
The old reset code was overly complicated and never worked properly.
Replace it with a simpler sequence that uses a couple of shift registers
to assert resets:

- Wait a number of external clock cycles before removing reset from
  the PLL.

- After the PLL locks and the external reset button isn't pressed,
  wait a number of PLL clock cycles before removing reset from the SOC.

Signed-off-by: Anton Blanchard <>
5 years ago