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gensh4: Improve ROM vs RAM startup configuration

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This commit is contained in:
Joel Sherrill
2014-08-25 16:53:13 -05:00
parent bf1f876483
commit 3d99c17deb
2 changed files with 16 additions and 9 deletions
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13
c/src/lib/libbsp/sh/gensh4/configure.ac
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@@ -23,12 +23,13 @@ AC_DEFINE_UNQUOTED(
# START_HW_INIT
# This switch selects whether 'early_hw_init()' is called from
# 'start.S'; 'bsp_hw_init()' is always called from 'bspstart.c'
#
START_HW_INIT=${START_HW_INIT-1}
AC_DEFINE_UNQUOTED(
[START_HW_INIT],
[$START_HW_INIT],
[Whether to call early_hw_init from start.S])
RTEMS_BSPOPTS_SET([START_HW_INIT],[*],[0])
RTEMS_BSPOPTS_HELP([START_HW_INIT],
[Whether to call early_hw_init from start.S])
RTEMS_BSPOPTS_SET([COPY_DATA_FROM_ROM],[*],[0])
RTEMS_BSPOPTS_HELP([COPY_DATA_FROM_ROM],
[Whether to copy data from ROM to RAM in start.S])
RTEMS_BSP_CLEANUP_OPTIONS(0, 0)

12
c/src/lib/libbsp/sh/gensh4/start/start.S
View File

@@ -80,10 +80,10 @@ fake_func:
bt hw_init_end
nop
#if defined(START_HW_INIT) /* from $RTEMS_BSP.cfg */
#if START_HW_INIT /* from $RTEMS_BSP.cfg */
! Initialize minimal hardware
! to run hw_init we need to calculate its address
! as it is before data coping
! as it is before data copying
mov.l hw_init_k, r0
mov.l copy_start_k, r1
mov.l copy_end_k, r2
@@ -102,6 +102,7 @@ fake_func:
#endif /* START_HW_INIT */
hw_init_end:
#if COPY_DATA_FROM_ROM
! copy data from rom to ram
mov.l copy_start_k, r0
mov.l copy_end_k, r1
@@ -123,6 +124,7 @@ copy_data_cycle:
nop
end_of_copy_data_cycle:
#endif
! go to 0x8....... adresses
mov.l real_address_k, r0
lds r0, pr
@@ -193,12 +195,16 @@ __stop:
END_CODE
.align 2
#if START_HW_INIT
copy_start_k:
.long copy_start
copy_end_k:
.long copy_end
#endif
#if COPY_DATA_FROM_ROM
copy_start_in_rom_k:
.long copy_start_in_rom
#endif
real_address_k:
.long real_address
@@ -219,7 +225,7 @@ main_k:
exit_k:
.long SYM(_exit)
#ifdef START_HW_INIT /* from $RTEMS_BSP.cfg */
#if START_HW_INIT /* from $RTEMS_BSP.cfg */
hw_init_k:
.long SYM(early_hw_init)
#endif /* START_HW_INIT */