Imagelibrary/rtems
1
0
Fork 1
mirror of https://gitlab.rtems.org/rtems/rtos/rtems.git synced 2025-12-05 15:15:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

2010-03-10 Marc Pignat <marc.pignat@hevs.ch>

Browse Source 
PR 1488/bsps
	* start/start.S: Micromon on bf537 uses DMA for UART reception.
	This prevents the UART driver in RTEMS from working (and also
	causes received characters to be stored in a buffer that RTEMS
	doesn't know about, so it's potentially dangerous, but in practice
	the risk is small since an RTEMS app intended to be booted from
	Micromon would normally be configured to leave the RAM Micromon
	uses reserved).  The attached patch corrects this by disabling
	all DMA channels at startup.
This commit is contained in:
Joel Sherrill
2010-03-10 17:22:05 +00:00
parent ee07b99715
commit 543f17b391
2 changed files with 27 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
c/src/lib/libbsp/bfin/bf537Stamp/ChangeLog
View File

@@ -1,3 +1,15 @@
2010-03-10 Marc Pignat <marc.pignat@hevs.ch>
PR 1488/bsps
* start/start.S: Micromon on bf537 uses DMA for UART reception.
This prevents the UART driver in RTEMS from working (and also
causes received characters to be stored in a buffer that RTEMS
doesn't know about, so it's potentially dangerous, but in practice
the risk is small since an RTEMS app intended to be booted from
Micromon would normally be configured to leave the RAM Micromon
uses reserved). The attached patch corrects this by disabling
all DMA channels at startup.
2009-12-11 Ralf Corsépius <ralf.corsepius@rtems.org>
* console/console-io.c: Let bf537Stamp_BSP_poll_char return int.

18
c/src/lib/libbsp/bfin/bf537Stamp/start/start.S
View File

@@ -5,6 +5,7 @@
#include <libcpu/bf537.h>
#include <libcpu/sicRegs.h>
#include <libcpu/cecRegs.h>
#include <libcpu/dmaRegs.h>
#include <libcpu/coreTimerRegs.h>
#ifndef LO
@@ -53,6 +54,17 @@ __start:
r0 = 0xffff (z);
[p0] = r0;
/* disable all dma channels */
p0.h = HI(DMA0_BASE_ADDRESS + DMA_CONFIG_OFFSET);
p0.l = LO(DMA0_BASE_ADDRESS + DMA_CONFIG_OFFSET);
p1 = DMA_PITCH;
p2 = DMA_CHANNELS;
r0 = ~DMA_CONFIG_DMAEN;
lsetup(loop1,loop2) lc0 = p2;
loop1: r1 = w[p0];
r1 = r0 & r1;
loop2: w[p0 ++ p1] = r1.l;
/* this is so we can stay in supervisor mode and still be able to
accept interrupts later. */
p0.h = start;
@@ -94,9 +106,9 @@ start:
r0 = 0;
/* Set _bss_start until _end to zero */
lsetup(loop1,loop2) lc0 = p1;
loop1: b[p0] = r0;
loop2: p0 +=1;
lsetup(loop3,loop4) lc0 = p1;
loop3: b[p0] = r0;
loop4: p0 +=1;
l0 = 0;
l1 = 0;