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drivers: hwinfo stm32h5 device must disable icache to access UID_BASE

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Reading the UID_BASE_ADDRESS requires disabling the icache
of the stm32h5x mcu.
Else a bus fault error occurs reading Address: 0x8fff800-0x8fff808
Enable afterwards.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2023-01-20 14:40:04 +01:00 committed by Carles Cufí
parent 429be3608c
commit 8d5ff8cb68
1 changed files with 11 additions and 0 deletions
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11
drivers/hwinfo/hwinfo_stm32.c
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@ -7,6 +7,9 @@
#include <soc.h>
#include <stm32_ll_utils.h>
#include <stm32_ll_rcc.h>
#if defined(CONFIG_SOC_SERIES_STM32H5X)
#include <stm32_ll_icache.h>
#endif /* CONFIG_SOC_SERIES_STM32H5X */
#include <zephyr/drivers/hwinfo.h>
#include <string.h>
#include <zephyr/sys/byteorder.h>
@ -19,10 +22,18 @@ ssize_t z_impl_hwinfo_get_device_id(uint8_t *buffer, size_t length)
{
struct stm32_uid dev_id;
#if defined(CONFIG_SOC_SERIES_STM32H5X)
LL_ICACHE_Disable();
#endif /* CONFIG_SOC_SERIES_STM32H5X */
dev_id.id[0] = sys_cpu_to_be32(LL_GetUID_Word2());
dev_id.id[1] = sys_cpu_to_be32(LL_GetUID_Word1());
dev_id.id[2] = sys_cpu_to_be32(LL_GetUID_Word0());
#if defined(CONFIG_SOC_SERIES_STM32H5X)
LL_ICACHE_Enable();
#endif /* CONFIG_SOC_SERIES_STM32H5X */
if (length > sizeof(dev_id.id)) {
length = sizeof(dev_id.id);
}