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Initialize uart_bus_space_mem.

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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
This commit is contained in:
Colin Percival 2019-03-22 06:28:37 +00:00
parent b8bfd8fc06
commit 0624eddcff
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345406
1 changed files with 2 additions and 1 deletions
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3
sys/dev/uart/uart_cpu_arm64.c
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@ -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)