svn commit: r345406 - head/sys/dev/uart

[Colin Percival]

Author: cperciva
Date: Fri Mar 22 06:28:37 2019
New Revision: 345406
URL: https://svnweb.freebsd.org/changeset/base/345406

Log:
  Initialize uart_bus_space_mem.
  
  This value was being used uninitialized, resulting in predictable issues
  on systems with memory-mapped UART registers.
  
  A case could be made that memmap_bus should be declared in a header
  rather than being declared in each .c file which needs to refer to it,
  but that's a broader style question.
  
  This commit unbreaks hw.uart.console="mm:..." on ARM64.
  
  Submitted by:	Greg V

Modified:
  head/sys/dev/uart/uart_cpu_arm64.c

Modified: head/sys/dev/uart/uart_cpu_arm64.c
==============================================================================
--- head/sys/dev/uart/uart_cpu_arm64.c	Fri Mar 22 06:21:03 2019	(r345405)
+++ head/sys/dev/uart/uart_cpu_arm64.c	Fri Mar 22 06:28:37 2019	(r345406)
@@ -65,8 +65,9 @@ __FBSDID("$FreeBSD$");
 /*
  * UART console routines.
  */
+extern struct bus_space memmap_bus;
 bus_space_tag_t uart_bus_space_io;
-bus_space_tag_t uart_bus_space_mem;
+bus_space_tag_t uart_bus_space_mem = &memmap_bus;
 
 int
 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)