soc: k64f MPU configured to always allow USB
Because NXP MPU's regions are dynamically enabled/disabled, USB device's access maybe restricted when switching out of a task. Background DMA transfers to/from RAM may happen during MPU region reconfiguration or core idling. Enabled USB (Kinetis MPU Master 4) to always have access to RAM address space. Signed-off-by: Andrei Gansari <andrei.gansari@nxp.com>
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2 changed files with 6 additions and 5 deletions
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@ -118,11 +118,12 @@
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#define REGION_USER_RO_ATTR {(MPU_REGION_READ | \
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MPU_REGION_SU)}
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/* ENET device (Master 3) will not be able to access RAM when
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ram region is dynamically disabled in NXP MPU.
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/* ENET (Master 3) and USB (Master 4) devices will not be able
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to access RAM when the region is dynamically disabled in NXP MPU.
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DEBUGGER (Master 1) can't be disabled in Region 0. */
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#define REGION_DEBUGGER_AND_DEVICE_ATTR {((MPU_REGION_SU) | \
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((UM_READ | UM_WRITE) << BM3_UM_SHIFT))}
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((UM_READ | UM_WRITE) << BM3_UM_SHIFT) | \
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(BM4_PERMISSIONS))}
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#define REGION_DEBUG_ATTR {MPU_REGION_SU}
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@ -8,8 +8,8 @@
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static const struct nxp_mpu_region mpu_regions[] = {
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/* Region 0 */
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/* Debugger access can't be disabled; ENET devices will not be able to
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* access RAM when it's region is dynamically disabled in NXP MPU.
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/* Debugger access can't be disabled; ENET and USB devices will not be able
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* to access RAM when their regions are dynamically disabled in NXP MPU.
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*/
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MPU_REGION_ENTRY("DEBUGGER_0",
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0,
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