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Blackfin arch: document why we have to touch the UART peripheral in our boot up code 

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Frysinger 2007-05-21 18:09:27 +08:00 committed by Linus Torvalds
parent ef9256d283
commit 5079df993c
3 changed files with 6 additions and 3 deletions
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3
arch/blackfin/mach-bf533/head.S
View File

@ -173,7 +173,8 @@ ENTRY(__stext)
STI R2;
#endif
/* Initialise UART */
/* Initialise UART - when booting from u-boot, the UART is not disabled
* so if we dont initalize here, our serial console gets hosed */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);
r0 = 0x0(Z);

3
arch/blackfin/mach-bf537/head.S
View File

@ -181,7 +181,8 @@ ENTRY(__stext)
SSYNC;
#endif
/*Initialise UART*/
/* Initialise UART - when booting from u-boot, the UART is not disabled
* so if we dont initalize here, our serial console gets hosed */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);
r0 = 0x0(Z);

3
arch/blackfin/mach-bf561/head.S
View File

@ -127,7 +127,8 @@ ENTRY(__stext)
STI R2;
#endif
/* Initialise UART*/
/* Initialise UART - when booting from u-boot, the UART is not disabled
* so if we dont initalize here, our serial console gets hosed */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);
r0 = 0x0(Z);