On Sat, 29 Jul 2023 15:30:10 +0200 Marek Vasut <ma...@denx.de> wrote:
> The MXS starts with CPSR V bit set, which makes the CPU jump to high > vectors in case of an exception. Those high vectors are located at > 0xffff0000, which is where the BootROM exception table is located as > well. U-Boot should handle exceptions on its own using its own > exception handling code, which is located at 0x0, i.e. at low > vectors. Clear the CPSR V bit, so that the CPU would jump to low > vectors on exception instead, and therefore run the U-Boot exception > handling code. > > Signed-off-by: Marek Vasut <ma...@denx.de> > --- > Cc: "NXP i.MX U-Boot Team" <uboot-...@nxp.com> > Cc: Fabio Estevam <feste...@gmail.com> > Cc: Lukasz Majewski <lu...@denx.de> > Cc: Stefano Babic <sba...@denx.de> > --- > arch/arm/cpu/arm926ejs/mxs/mxs.c | 3 +++ > arch/arm/cpu/arm926ejs/mxs/spl_boot.c | 4 ++++ > 2 files changed, 7 insertions(+) > > diff --git a/arch/arm/cpu/arm926ejs/mxs/mxs.c > b/arch/arm/cpu/arm926ejs/mxs/mxs.c index 4d21e3df76e..d64a8328b04 > 100644 --- a/arch/arm/cpu/arm926ejs/mxs/mxs.c > +++ b/arch/arm/cpu/arm926ejs/mxs/mxs.c > @@ -85,6 +85,9 @@ void mx28_fixup_vt(uint32_t start_addr) > /* cppcheck-suppress nullPointer */ > vt[i + 8] = start_addr + (4 * i); > } > + > + /* Make sure ARM core points to low vectors */ > + set_cr(get_cr() & ~CR_V); > } > > #ifdef CONFIG_ARCH_MISC_INIT > diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c > b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c index > 5598c552ab9..4a7dfc6a2ae 100644 --- > a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c +++ > b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c @@ -17,6 +17,7 @@ > #include <asm/arch/sys_proto.h> > #include <asm/gpio.h> > #include <asm/sections.h> > +#include <asm/system.h> > #include <linux/compiler.h> > > #include "mxs_init.h" > @@ -104,6 +105,9 @@ static void mxs_spl_fixup_vectors(void) > > /* cppcheck-suppress nullPointer */ > memcpy(0x0, &_start, 0x60); > + > + /* Make sure ARM core points to low vectors */ > + set_cr(get_cr() & ~CR_V); > } > > static void mxs_spl_console_init(void) Reviewed-by: Lukasz Majewski <lu...@denx.de> Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Erika Unter HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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