The MPU region dedicated for SDRAM for STM32F4 SoCs family
was set to 16MB, but STM32F429 Evaluation board have 32MB of SDRAM.
When kernel starts, only first 16MB of SDRAM are configured with XN
(eXecute Never) bit disabled, whereas kernel is using 32MB.
To avoid such situation in the future, extend this MPU region to 512MB
as for STM32F7/H7.
It fixes the following user land exception on STM32F429 Evaluation
board :
[ 1.713002] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 1.722605] devtmpfs: mounted
[ 1.733057] Freeing unused kernel memory: 72K
[ 1.737622] This architecture does not have kernel memory protection.
[ 1.744070] Run /sbin/init as init process
[ 1.906850]
[ 1.906850] Unhandled exception: IPSR = 00000004 LR = fffffffd
[ 1.914282] CPU: 0 PID: 1 Comm: init Not tainted 5.1.0-00002-gcf9ca5719954 #6
[ 1.921433] Hardware name: STM32 (Device Tree Support)
[ 1.926601] PC is at 0x1a00b64
[ 1.929642] LR is at (null)
[ 1.932669] pc : [<01a00b64>] lr : [<00000000>] psr: 01000000
[ 1.938993] sp : 01a5cfb0 ip : 00000000 fp : 00000000
[ 1.944269] r10: 01a43b00 r9 : 00000000 r8 : 00000000
[ 1.949564] r7 : 00000000 r6 : 00000000 r5 : 00000000 r4 : 00000000
[ 1.956168] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 00000000
[ 1.962701] xPSR: 01000000
[ 1.965506] CPU: 0 PID: 1 Comm: init Not tainted 5.1.0-00002-gcf9ca5719954 #6
[ 1.972658] Hardware name: STM32 (Device Tree Support)
[ 1.978132] [<0000c009>] (unwind_backtrace) from [<0000b24f>] (show_stack+0xb/0xc)
[ 1.986024] [<0000b24f>] (show_stack) from [<0000b947>] (__invalid_entry+0x4b/0x4c)
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
The Quad-SPI interface is able to manage up to 256Mbytes Flash
memory starting from 0x90000000 to 0x9FFFFFFF in the memory
mapped mode.
Add a dedicated MPU region into stm32_region_config.
See application note AN4760 available at www.st.com
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
This allows to boot all STM32F7 and STM32H7 boards independently
of the amount of embedded SDRAM.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>
The Memory Protection Unit(MPU) allows to partition memory into regions
and set individual protection attributes for each region. In absence
of MPU a default map[1] will take effect. Add support for configuring
MPU on Cortex-R, by reusing the existing support for Cortex-M processor.
[1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0460d/I1002400.html
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.
In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.
This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.
Signed-off-by: Tom Rini <trini@konsulko.com>
On linux kernel side, on STM32F7 and STM32H7 SoCs, DMA requires
uncachable regions. These regions are defined in DT.
Since kernel linux v4.15, on ARMv7-M Cortex, kernel is able
to configure MPU regions depending on DT settings.
As kernel is able to configure MPU, this allows to remove
MPU region settings in bootloader.
On Cortex M processors, MPU allows to use a default memory map.
(see B3.5.4 MPU Control Register, MPU_CTRL in
https://developer.arm.com/products/architecture/m-profile/docs/ddi0403/latest/armv7-m-architecture-reference-manual)
Use the default memory map as background region for all STM32 SoCs
family with an additional MPU region corresponding to the SDRAM area.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
MPU's region setup can be factorized between STM32F4/F7/H7 SoCs family
and used a common MPU's region config.
Only one exception for STM32H7 which doesn't have device area
located at 0xA000 0000.
For STM32F4, configure_clocks() need to be moved from arch_cpu_init()
to board_early_init_f().
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Vikas Manocha <vikas.manocha@st.com>
2017-11-29 22:30:50 -05:00
Renamed from arch/arm/mach-stm32/stm32h7/soc.c (Browse further)
