Applicable for

1. Article purpose[edit source]

The STM32MP15xx device errata sheet^[1] lists the different device limitations and explains the corresponding workarounds (software and/or hardware) if any.

The objective of this article is to explain which of the workarounds, described in this errata sheet, are applicable and implemented in ecosystem release v4.1.0 .

This article lists

errata to be workaround by the customers,
errata workaround implemented in STM32MPU Ecosystem releases,
and errata not applicable in STM32MPU Ecosystem releases.

Errata, present in STM32MP15xx device errata sheet^[1] and not listed in this article, have no workaround implemented in STM32MPU Ecosystem releases.

2. Legend[edit source]

The section column refers to the number of the erratum chapter in the errata sheet document.

Rev.Y columns , present in the tables below, refer to the availability and status of a given errata workaround for the described erratum in errata sheet document:

A = workaround available
P = partial workaround available
N = no workaround available

OpenSTLinux and CubeMP1 columns , present in the tables below, refer to the availability of a workaround for a given STM32MP13 ecosystem release:

U = workaround to implement by User
I = workaround Implemented
NA= Errata Not Applicable in ST software release

Wave your mouse over a status in the table to display the corresponding legend.

3. Workarounds to implement by customer[edit source]

Function	Section	Limitation	Rev.Z			Comment
Arm^® Cortex^®-A7 core	2.1.1	Memory locations might be accessed speculatively due to instruction fetches when HCR.VM is set	A	U	NA	OpenSTLinux distribution does not activate Arm^® Cortex^®-A7 Hypervisor mode and hence the Virtual Memory second stage of translation. The customer should implement the workaround if the Hypervisor mode is used in his/her product.
Arm^® Cortex^®-M4 core	2.2.1	Interrupted loads to SP can cause erroneous behavior	A	NA	U	STM32CubeMP1_Package: Limitation only on hand-written assembly code. The customer should implement the workaround in the product assembly code.
	2.2.2	VDIV or VSQRT instructions might not complete correctly when very short ISRs are used	A	NA	U	STM32CubeMP1_Package provided as example. The customer should implement the workarounds according to the user code and product configuration.
	2.2.3	Store immediate overlapping exception return operation might vector to incorrect interrupt	A	NA	U	STM32CubeMP1_Package: Minor impact on the system. The customer should implement the workaround according to the MPU configuration.
DDRPHYC	2.4.2	DDR_CLK jitter out of JEDEC requirement for 32-bit LPDDR2/LPDDR3 at low device Tj	A	U	U	ST boards use DDR3 instead of LPDDR2/3. The customer should implement the workaround if he uses LPDDR2/3 in his board design.
DDRPHYC	2.4.3	Data corruption at low device Tj combined with low 32-bit LPDDR2/LPDDR3 I/O supply voltage	A	U	U	ST boards use DDR3 instead of LPDDR2/3. The customer should implement the workaround if he uses LPDDR2/3 in his board design.
DMAMUX	2.7.4	Wrong input DMA request routed upon specific DMAMUX_CxCR register write coinciding with synchronization event	A	NA	U	STM32CubeMP1_Package: The customer should provide the right DMAMUX signal polarity configuration when calling the HAL_DMAEx_ConfigMuxSync() function provided in STM32CubeMP1_Package Src/stm32mp1xx_hal_dma_ex.c .
FMC	2.8.1	NOR Flash memory/PSRAM incorrect bus turnaround timing	A	U		OpenSTLinux distribution: Delays to applied by customer device tree.
ADC	2.10.4	ADC_AWDy_OUT reset by non-guarded channels	A	U	U	OpenSTLinux distribution: The customer should implement this workaround by configuring only ADC channels that are guarded by a watchdog in the device tree. STM32CubeMP1_Package: The customer should implement this workaround by configuring only ADC channels that are guarded by a watchdog in the application.
	2.10.7	ADC ANA0/ANA1 resolution limited when Gigabit Ethernet is used	P	U	U	OpenSTLinux distribution: The customer should implement this workaround by limiting the ADC data resolution in the device tree STM32CubeMP1_Package: The customer should implement this workaround by limiting the ADC data resolution in the application.
	2.10.8	ADC missing codes in differential 16-bit static acquisition	P	U	U	OpenSTLinux distribution: The customer should implement this workaround by configuring only ADC channels that are guarded by a watchdog in the device tree STM32CubeMP1_Package: The customer should implement this workaround by configuring only ADC channels that are guarded by a watchdog in the application.
DAC	2.11.1	Invalid DAC channel analog output if the DAC channel MODE bitfield is programmed before DAC initialization	A	NA	U	STM32CubeMP1_Package: Both Normal and Sample and hold modes are supported by the HAL drivers. The user should call properly HAL_DAC_Init before HAL_DAC_ConfigChannel to avoid the issue.
LPTIM	2.17.1	Device may remain stuck in LPTIM interrupt when entering Stop mode	A	NA	U	OpenSTLinux distribution: The LPTIM interrupt is not used. STM32CubeMP1_Package: The customer should implement this workaround in MspDeinit().

4. Workarounds implemented in STM32MP15 ecosystem releases[edit source]

Function	Section	Limitation	Rev.Z			Comment
Arm^® Cortex^®-A7 core	2.1.2	Cache maintenance by set/way operations can execute out of order	A	I	NA	OpenSTLinux distribution: Implementation accepted by the community since Linux® kernel v5.3 in arch/arm/Kconfig (refer to ARM_ERRATA_814220).
System	2.3.3	HSE external oscillator required in some LTDC use cases	P	I		OpenSTLinux distribution: Implemented in device tree. Hardware implementation of the external oscillator connected to the HSE pins available on STM32MP157x-EV1 MB1263 Rev.C (aka "MB1263C") and STM32MP157x-DKx MB1272 Rev.C (aka "MB1272C").
	2.3.4	RCC cannot exit Stop and Low-power Stop modes	A	I
	2.3.5	Incorrect reset of glitch-free kernel clock switch	P	I		OpenSTLinux distribution: By default, STPMIC1 performs a VDDCORE reset on NRST activation.
	2.3.6	Limitation of aclk/hclk5/hclk6 to 200 MHz when used as SDMMC1/2 kernel clock	P	I		OpenSTLinux distribution: Implemented in device tree with a clock tree that uses a SDMMC1/SDMMC2 kernel clock source different from the aclk/hclk5/hclk6 bus clock.
	2.3.9	Cortex-M4 cannot use I/O compensation on Standby mode exit	A	I	NA	OpenSTLinux distribution: Implemented in device tree with a clock tree that uses a SDMMC1/SDMMC2 kernel clock source different from the aclk/hclk5/hclk6 bus clock.
	2.3.14	Boundary scan data unduly sampled on TCK falling edge	A	I		OpenSTLinux distribution: Implemented in device tree with a clock tree that uses a SDMMC1/SDMMC2 kernel clock source different from the aclk/hclk5/hclk6 bus clock.
QUADSPI	2.9.1	Memory-mapped read of last memory byte fails	P	I
VREFBUF	2.12.2	Overshoot on VREFBUF output	A	I
DTS	2.13.1	DTS incorrect operation with LSE as reference clock and PCLK enabled	P	I
LPTIM	2.17.2	MCU may remain stuck in LPTIM interrupt when clearing event flag	P	NA	I
RTC and TAMP	2.18.2	Calendar initialization may fail in case of consecutive INIT mode entry	P	I
I2C	2.19.1	Wrong data sampling when data setup time (tSU;DAT) is shorter than one I2C kernel clock period	P	I	I	OpenSTLinux distribution: Workaround implemented in device tree with a clock tree that configures the I2C kernel clock source to a frequency higher than 20 MHz.
SPI	2.21.1	Master data transfer stall at system clock much faster than SCK	A	I	I	OpenSTLinux distribution: SPI is disabled after each EOT STM32CubeMP1_Package: SPI is disabled after each EOT.
SPI	2.21.3	TXP interrupt occurring while SPI disabled	A	I	I	OpenSTLinux distribution: all interrupts are disabled before the SPI is disabled.
ETH	2.24.6	ARP offload function not effective	A	I

5. Workarounds not applicable in STM32MP15 ecosystem releases[edit source]

Function	Section	Limitation	Rev.Z			Comment
System	2.3.21	Wrong value in Coresight M4 ROM table	A	NA	NA	STM32CubeMP1_Package: DeviceID not used. All the examples provided are compiled for MP15.
DMAMUX	2.7.1	SOFx not asserted when writing into DMAMUX_CFR register	N	NA		OpenSTLinux distribution: DMA synchronization event is not used.
	2.7.2	OFx not asserted for trigger event coinciding with last DMAMUX request	N	NA		OpenSTLinux distribution: DMA Trigger event is not used.
	2.7.3	OFx not asserted when writing into DMAMUX_RGCFR register	N	NA		OpenSTLinux distribution: DMA Trigger event is not used.
	2.7.4	Wrong input DMA request routed upon specific DMAMUX_CxCR register write coinciding with synchronization event	A	NA	U	OpenSTLinux distribution: DMA synchronization event is not used.
FMC	2.8.2	Incorrect FMC_CLK clock period when CLKDIV value is changed on-the-fly in continuous clock mode	A	NA		OpenSTLinux distribution: CLKDIV can't be changed on-the-fly.
	2.8.3	NAND Flash memory IREF/IFEF flags wrongly asserted just after enabling in FMC_IER	A	NA		OpenSTLinux distribution: IREF/IFEF flags are not used.
	2.8.4	Command sequencer accesses NAND Flash memory device while PBKEN bit is cleared in FMC_PCR	A	NA		OpenSTLinux distribution: PBKEN bit is set at probe time and never cleared on the flag.
	2.8.5	NAND Flash memory IREF flag wrongly asserted after reset	A	NA
ADC	2.10.1	New context conversion initiated without waiting for trigger when writing new context in ADC_JSQR with JQDIS = 0 and JQM = 0	A	NA		OpenSTLinux distribution: JQDIS = 1, this issue occurs only when JQDIS = 0.
	2.10.2	Two consecutive context conversions fail when writing new context in ADC_JSQR just after previous context completion with JQDIS = 0 and JQM = 0	A	NA		OpenSTLinux distribution: JQDIS = 1, this issue occurs only when JQDIS = 0.
	2.10.3	Unexpected regular conversion when two consecutive injected conversions are performed in Dual interleaved mode	A	NA		OpenSTLinux distribution: Dual mode is not implemented.
	2.10.5	Injected data stored in the wrong ADC_JDRx registers	A	NA		OpenSTLinux distribution: Injected conversion not implemented.
	2.10.6	ADC slave data may be shifted in Dual regular simultaneous mode	A	NA		OpenSTLinux distribution: Dual mode is not implemented.
DAC	2.11.1	Invalid DAC channel analog output if the DAC channel MODE bitfield is programmed before DAC initialization	A	NA	U	OpenSTLinux distribution:The Linux DAC driver uses only the Normal mode. It never needs to modify the MODE bitfield.
LPTIM	2.17.1	Device may remain stuck in LPTIM interrupt when entering Stop mode	A	NA	U	OpenSTLinux distribution: LPTIM interrupt is not used
LPTIM	2.17.2	MCU may remain stuck in LPTIM interrupt when clearing event flag	P	NA	I	OpenSTLinux distribution: LPTIM interrupt is not used
RTC and TAMP	2.18.5	REFCKON write protection associated to INIT KEY instead of CAL KEY	A	NA		OpenSTLinux distribution: REFCKON is not implemented in linux driver
I2C	2.19.3	Spurious master transfer upon own slave address match	P		NA	STM32CubeMP1_Package: The multimaster mode implementation of I2C HAL driver prevents such case from happening.
USART	2.20.1	Anticipated end-of-transmission signaling in SPI slave mode	A	NA		OpenSTLinux distribution: SPI slave mode is not implemented
SPI	2.21.2	Corrupted CRC return at non-zero UDRDET setting	P	NA		OpenSTLinux distribution: CRC is not supported
SPI	2.21.4	Possible corruption of last-received data depending on CRCSIZE setting	A	NA		OpenSTLinux distribution: CRC is not supported

6. References[edit source]

↑ ^1.0 ^1.1 STM32MP15 Errata sheets

[errata-1] 1.0 ^1.1 STM32MP15 Errata sheets

[1]

STM32MP15 ecosystem errata sheet

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