From: Nikolay Nikolov <nickysn@users.sourceforge.net>
Date: Sat, 10 Feb 2018 11:52:13 +0000 (+0200)
Subject: floppy: hold the DOR reset bit low for 4 microseconds, when resetting
X-Git-Tag: rel-1.12.0~41
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=b00a03a49e28d518435deeb22d119bbd959e78a3;p=seabios.git

floppy: hold the DOR reset bit low for 4 microseconds, when resetting

Signed-off-by: Nikolay Nikolov <nickysn@users.sourceforge.net>
---

diff --git a/src/hw/floppy.c b/src/hw/floppy.c
index 3012b3a..16989c2 100644
--- a/src/hw/floppy.c
+++ b/src/hw/floppy.c
@@ -328,6 +328,8 @@ floppy_enable_controller(void)
     dprintf(2, "Floppy_enable_controller\n");
     // Clear the reset bit (enter reset state), but set 'enable IRQ and DMA'
     floppy_dor_mask(FLOPPY_DOR_RESET, FLOPPY_DOR_IRQ);
+    // Real hardware needs a 4 microsecond delay
+    usleep(4);
     // Set the reset bit (normal operation) and keep 'enable IRQ and DMA' on
     floppy_dor_mask(0, FLOPPY_DOR_IRQ | FLOPPY_DOR_RESET);
     int ret = floppy_wait_irq();