On 2016年07月31日 22:27, Tom Rini wrote:
On Sun, Jul 31, 2016 at 11:59:19AM +0800, Ziyuan Xu wrote:
Hi Tom,
On 2016年07月29日 09:12, Tom Rini wrote:
On Fri, Jul 29, 2016 at 09:06:29AM +0800, Ziyuan Xu wrote:
Hi Tom,
On 2016年07月29日 08:34, Tom Rini wrote:
On Fri, Jul 29, 2016 at 07:34:09AM +0800, Ziyuan Xu wrote:
Hi Tom,
On 2016年07月29日 06:15, Tom Rini wrote: > On Thu, Jul 28, 2016 at 07:03:17PM +0800, Chen-Yu Tsai wrote: >> Hi, >> >> On Thu, Jul 28, 2016 at 6:13 PM, Ziyuan Xu xzy.xu@rock-chips.com wrote: >>> For ARMv7-A architecture, the valid ISB instruction is asm volatile("isb"). >>> >>> This patch fixes the U-Boot was stuck in invalidate_dcache_all() before >>> booting linux kernel, which occurred on rk3288-base development board >>> such as evb-rk3288, rock2-rk3288. And something output via console like: >>> >>> => bootz 0x2000000 >>> 0x02000000 >>> ramdisk start = 0x00000000, ramdisk end = 0x00000000 >>> Continuing to boot without FDT >>> Initial value for argc=3 >>> Final value for argc=3 >>> using: ATAGS >>> >>> Starting kernel ... >>> >>> Linux kernel exactly the same way(see arch/arm/include/asm/barrier.h). >>> >>> Signed-off-by: Ziyuan Xu xzy.xu@rock-chips.com >>> --- >>> >>> arch/arm/include/asm/system.h | 6 ++++-- >>> 1 file changed, 4 insertions(+), 2 deletions(-) >>> >>> diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h >>> index 2bdc0be..12d4ba0 100644 >>> --- a/arch/arm/include/asm/system.h >>> +++ b/arch/arm/include/asm/system.h >>> @@ -227,13 +227,15 @@ void __noreturn psci_system_reset(bool smc); >>> */ >>> void save_boot_params_ret(void); >>> >>> -#define isb() __asm__ __volatile__ ("" : : : "memory") >>> - >>> #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t"); >>> >>> #ifdef __ARM_ARCH_7A__ >>> +#define isb() __asm__ __volatile__ ("isb" : : : "memory") >>> + >>> #define wfi() __asm__ __volatile__ ("wfi" : : : "memory") >>> #else >>> +#define isb() __asm__ __volatile__ ("" : : : "memory") >>> + >>> #define wfi() >>> #endif >>> >> arch/arm/include/asm/barriers.h already has a proper set of >> ISB/DSB macros. Please consider using those instead. > Please fix arch/arm/include/asm/system.h to use the macros found in > barriers.h rather than have their own versions. Thanks! If I understand correctly, I can change into as bellow: #define isb() ISB How about it?
Well, I'd rather not have ISB and isb, just ISB, which means we might have to fix other places too. If that starts looking too huge, we can do this in steps and just do what you suggested for now and for next release move everything over.
As I mentioned before, arch/arm/include/asm/barriers.h defined ISB macro. If I only want to fix the issue which I hit on rk3288 board, I just use ISB in arch/arm/include/asm/system.h::set_cr() instead of isb(). But isb() had been invoked in some places.
I can't verify integrallty after all revision, it involve some boards and feature. But this does fix for rk3288, if you agree with me, could you apply it provisionally?:-)
I would really like to try and fix the other possibly latent issues that we have by not calling a real ISB. Please try moving towards all places that need an isb calling the correct one from barriers.h and giving it a spin on the hardware you have available.
I used ISB instead of isb(), everything works sane on my rockchip rk3288 boards.:-) Will you send a patch to fix it and other possibly latent issues? Or apply this temporarily?
Please send a patch of all of the changes you did, thanks!
Tom, it's impracticable only use ISB for all situation instead of isb(). There're two isb() invocation in drivers/ddr/fsl/fsl_ddr_gen4.c, and not only used on ARM architecture board, but also powerpc. See below:
arch/powerpc/include/asm/config_mpc85xx.h:769:#define CONFIG_SYS_FSL_DDRC_GEN4 arch/powerpc/include/asm/config_mpc85xx.h:822:#define CONFIG_SYS_FSL_DDRC_GEN4 arch/powerpc/include/asm/config_mpc85xx.h:955: !defined(CONFIG_SYS_FSL_DDRC_GEN4) arch/arm/include/asm/arch-ls102xa/config.h:100:#define CONFIG_SYS_FSL_DDRC_GEN4 arch/arm/include/asm/arch-fsl-layerscape/config.h:13:#define CONFIG_SYS_FSL_DDRC_GEN4
If you insist on ISB only, we have to differentiate arch via CONFIG_SYS_ARCH, seems twisted. How about it? #define isb() ISB