Hi Vignesh! On April 6, 2023 thus sayeth Vignesh Raghavendra: > From: Nitin Yadav <n-ya...@ti.com> > > Errata doc: https://www.ti.com/lit/pdf/sprz457 > Errata ID i2331 CPSW: Device lockup when reading CPSW registers > > Details: A device lockup can occur during the second read of any CPSW > subsystem register after any MAIN domain power on reset (POR). A MAIN > domain POR occurs using the hardware MCU_PORz signal, or via software > using CTRLMMR_RST_CTRL.SW_MAIN_POR or CTRLMMR_MCU_RST_CTRL.SW_MAIN_POR. > After these resets, the processor and internal bus structures may get > into a state which is only recoverable with full device reset using > MCU_PORz. > Due to this errata, Ethernet boot should not be used on this device. > > Workaround(s): To avoid the lockup, a warm reset should be issued after > a MAIN domain POR and before any access to the CPSW registers. The warm > reset realigns internal clocks and prevents the lockup from happening. > Workaround above errata by calling do_reset() in case of cold boot in > order to trigger warm reset. This needs enabling SYSRESET driver in R5 > SPL to enable TI SCI reset driver. > > Signed-off-by: Nitin Yadav <n-ya...@ti.com> > Signed-off-by: Vignesh Raghavendra <vigne...@ti.com> > --- > arch/arm/mach-k3/am642_init.c | 33 +++++++++++++++++++++++++++++++++ > configs/am64x_evm_r5_defconfig | 3 +++ > 2 files changed, 36 insertions(+) >
Thanks for sending this! Reviewed-by: Bryan Brattlof <b...@ti.com> ~Bryan
