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flash/stm32l4x: STM32L5 support programming when TZEN=1 and RDP=0x55 

when RDP level is 0.5 the provided work-area should reside in non-secure RAM
to ensure that:
 - add a hint in the driver level
 - reduce the usage of secure RAM only when TZEN=1 and RDP is not 0.5
   (check the target configuration file)

Change-Id: Idbf2325e609b84ef8480eefdb49a176fdf7e07c7
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6035
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>
Tested-by: jenkins
This commit is contained in:
Tarek BOCHKATI 2021-01-22 13:15:52 +01:00 committed by Oleksij Rempel
parent c9d40366ad
commit e609d5a5de
2 changed files with 12 additions and 1 deletions
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7
src/flash/nor/stm32l4x.c
View File

@ -1434,6 +1434,13 @@ static int stm32l4_write(struct flash_bank *bank, const uint8_t *buffer,
if (retval != ERROR_OK)
goto err_lock;
/* For TrustZone enabled devices, when TZEN is set and RDP level is 0.5,
* the debug is possible only in non-secure state.
* Thus means the flashloader will run in non-secure mode,
* and the workarea need to be in non-secure RAM */
if (stm32l4_info->tzen && (stm32l4_info->rdp == RDP_LEVEL_0_5))
LOG_INFO("RDP level is 0.5, the work-area should reside in non-secure RAM");
retval = stm32l4_write_block(bank, buffer, offset, count / 8);
err_lock:

6
tcl/target/stm32l5x.cfg
View File

@ -173,7 +173,11 @@ $_TARGETNAME configure -event gdb-flash-erase-start {
} {
ahb_ap_secure_access
echo "TZEN option bit enabled"
set use_secure_workarea 1
# check if FLASH_OPTR.RDP is not Level 0.5
if {[expr {$FLASH_OPTR & 0xFF}] != 0x55} {
set use_secure_workarea 1
}
}
set workarea_addr [$_TARGETNAME cget -work-area-phys]