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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-04-20 14:03:39 +0200 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2012-05-02 10:27:08 +0200 |
| commit | 57d29cd5a99ef14de5c943ee2a14cbeb3f4422c2 (patch) | |
| tree | 50b7c3dc232051c8042ca9ab2f5b1b3e272705dc | |
| parent | bsp/genmcf548x: Fix BSP options (diff) | |
| download | rtems-57d29cd5a99ef14de5c943ee2a14cbeb3f4422c2.tar.bz2 | |
bsp/genmcf548x: Enable FPU in BSP startup code
| -rw-r--r-- | c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c b/c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c index 67774a2ad7..6eb4c5fd47 100644 --- a/c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c +++ b/c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c @@ -70,8 +70,10 @@ extern char WorkAreaBase []; #define m68k_set_acr3(_acr3) asm volatile ("movec %0,#0x0007" : : "d" (_acr3)) /* - * Set initial cacr mode, mainly enables branch/intruction/data cache and - * switch off FPU. + * Set initial CACR mode, mainly enables branch/instruction/data cache. The + * FPU must be switched on in the BSP startup code since the + * _Thread_Start_multitasking() will restore the floating-point context of the + * initialization task if necessary. */ static const uint32_t BSP_CACR_INIT = MCF548X_CACR_DEC /* enable data cache */ | MCF548X_CACR_BEC /* enable branch cache */ @@ -80,8 +82,7 @@ static const uint32_t BSP_CACR_INIT = MCF548X_CACR_DEC /* enable data cache */ /* set data cache mode to write-through */ | MCF548X_CACR_DESB /* enable data store buffer */ | MCF548X_CACR_DDSP /* data access only in supv. mode */ - | MCF548X_CACR_IDSP /* instr. access only in supv. mode */ - | MCF548X_CACR_DF; /* disable FPU */ + | MCF548X_CACR_IDSP; /* instr. access only in supv. mode */ /* * CACR maintenance functions @@ -273,15 +274,6 @@ void bsp_start( void ) /* Initialize CACR shadow register */ _CPU_cacr_shadow = BSP_CACR_INIT; - /* Switch on FPU in CACR shadow register if necessary */ - if ((Configuration_POSIX_API.number_of_initialization_threads > 0) || - ((Configuration_RTEMS_API.number_of_initialization_tasks > 0) && - (Configuration_RTEMS_API.User_initialization_tasks_table - ->attribute_set & RTEMS_FLOATING_POINT) != 0) - ) { - _CPU_cacr_shadow &= ~MCF548X_CACR_DF; - } - /* * Load the shadow variable of CACR with initial mode and write it to the * CACR. Interrupts are still disabled, so there is no need for surrounding |