On 29/5/18 5:12 am, Siddons, David wrote:
> Has anyone implemented RTEMS on an Avnet Picozed board? What needs to be
> changed
> in the existing ZynQ support to do that?
There should not be too much. I have these functions with suitable values ....
/*
* Provide the peripheral clock freq.
*/
uint32_t a9mpcore_clock_periphclk(void)
{
return XPAR_CPU_CORTEXA9_0_CPU_CLK_FREQ_HZ / 2;
}
uint32_t zynq_clock_cpu_1x(void)
{
return 100000000U;
}
You may want to provide an MMU table that fits your needs so you can access the
AXI channels to the PL fabric:
#ifdef ARMV7_CP15_START_DEFAULT_SECTIONS
BSP_START_DATA_SECTION static const arm_cp15_start_section_config
zynq_mmu_config_table[] = {
ARMV7_CP15_START_DEFAULT_SECTIONS,
{
.begin = 0xe0000000U,
.end = 0xe0200000U,
.flags = ARMV7_MMU_DEVICE
}
};
BSP_START_TEXT_SECTION void zynq_setup_mmu_and_cache(void)
{
uint32_t ctrl = arm_cp15_start_setup_mmu_and_cache(
ARM_CP15_CTRL_A,
ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_Z
);
arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
ctrl,
(uint32_t *) bsp_translation_table_base,
ARM_MMU_DEFAULT_CLIENT_DOMAIN,
&zynq_mmu_config_table[0],
RTEMS_ARRAY_SIZE(zynq_mmu_config_table)
);
}
#endif
These functions are weak in RTEMS so providing them in an object file in your
application overrides the RTEMS defaults for this BSP.
Chris
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