On Tue, Apr 07, 2020 at 05:31:11PM +0200, Giorgio Dal Molin wrote: > The Domain Access Control Register (DACR) in CP15 is banked between > secure and non secure mode: there a copy of the reg. in secure mode and a > second copy in non secure mode. > As barebox boots on the imx7 SOC it runs in secure mode and initializes > the secure-mode copy of DACR (with 0x00000001). > After switching to non secure mode, for example with the command 'smc -n' > or while booting a kernel image with global.bootm.secure_state=nonsecure, > the active value of DACR is the copy in non-secure mode and that copy > was still uninitialized and in an UNKNOWN state. > > This caused the cpu to hang as soon as the MMU was enabled in non-secure > mode. > > We fix this by reading the DACR value in secure mode just before switching > to non secure and then initializing it again with the same value. > > Signed-off-by: Giorgio Dal Molin <giorgio.nicole@xxxxxxxx> > --- > arch/arm/cpu/mmu.h | 9 +++++++++ > arch/arm/cpu/sm.c | 4 +++- > 2 files changed, 12 insertions(+), 1 deletion(-) Applied, thanks Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
