Hi,
We are able to figure out the issue. PERIPHBASE returned on ARNDALE board was 0x10500000 and adding GIC offset was creating an incorrect address.
please see: https://github.com/apritzel/u-boot-hypmode/commit/5d9c4209907c6d67dadd033887...
Setting CONFIG_ARM_GIC_BASE_ADDRESS as 0x10480000 in arndale.h solves the issue.
Yes, I spotted that before and deliberately introduced that variable for the Exynos SoCs.
The u-boot code needs to be fixed for arndale right ? Please confirm
I could get the Arndale to boot with this above patch. But only after a warm reboot: 1) boot the board up, load the kernel and launch it: Linux will reboot very early (before any useful output via earlyprintk) 2) (back in u-boot:) load the kernel again and launch it: works
I got both cores in HYP mode and KVM initialized fine.
I lost access to my board, so if you could debug this I would be grateful.
Thanks, Andre.
Regards Manish armdev Team @FTM
On 13-Mar-2014, at 11:20 am, armdev armdev.ftm@gmail.com wrote:
Got a mail that Andre is not with linaro, Adding Christoffer Dall
On 13-Mar-2014, at 11:17 am, armdev armdev.ftm@gmail.com wrote:
Hi Andrey ,
This is wrt your patch set which enabled the switch to non-sec and hip mode in armv7. We have a small piece of code which we run in hypmode using the bootm command on arndale board
While this code was trying to access the GICD_ISENABLR0 (0x10481100), read was always returning 0, while as per the reset value it should be 0x0000ffff. Debugged more in u-boot and added prints.
This is the log, our observation is that in _nonsec_init() there is something that is causing the issue. Now It can be an issue or a gap in our understanding. Ideally we should be able to read the GICD_ISENABLR value as 0xffff. Can you please help us in find out how to read GIC values properly in hyp mode.
armv7_switch_nonsec cpsr =600001d3 REGS ffff Before write to group regs cpsr =600001d3 REGS ffff Before _nonsec_init() cpsr =600001d3 REGS ffff After _nonsec_init() cpsr =600001d3 REGS 0
HYP mode: successful. armv7_switch_hyp cpsr =600001da REGS 0
Here is the diff of our modifications. (just added prints) diff --git a/arch/arm/cpu/armv7/virt-v7.c b/arch/arm/cpu/armv7/virt-v7.c index 2cd604f..f38f125 100644 --- a/arch/arm/cpu/armv7/virt-v7.c +++ b/arch/arm/cpu/armv7/virt-v7.c @@ -107,6 +107,10 @@ int armv7_switch_hyp(void) printf("HYP mode: switch not successful.\n"); return -1; }
printf("HYP mode: successful.\n");
printf("%s \r\n",__FUNCTION__);
printf("cpsr =%x\n", read_cpsr());
printf("REGS %x \n", *(uint32_t*)0x10481100);
return 0;
} @@ -116,6 +120,10 @@ int armv7_switch_nonsec(void) unsigned int reg; unsigned itlinesnr, i;
- printf("%s \r\n",__FUNCTION__);
- printf("cpsr =%x\n", read_cpsr());
- printf("REGS %x \n", *(uint32_t*)0x10481100);
- /* check whether the CPU supports the security extensions */ reg = read_id_pfr1(); if ((reg & 0xF0) == 0) {
@@ -140,6 +148,9 @@ int armv7_switch_nonsec(void) /* TYPER[4:0] contains an encoded number of available interrupts */ itlinesnr = readl(gic_dist_addr + GICD_TYPER) & 0x1f;
- printf("Before write to group regs \r\n");
- printf("cpsr =%x\n", read_cpsr());
- printf("REGS %x \n", *(uint32_t*)0x10481100); /* set all bits in the GIC group registers to one to allow access
- from non-secure state. The first 32 interrupts are private per
- CPU and will be set later when enabling the GIC for each core
@@ -147,11 +158,19 @@ int armv7_switch_nonsec(void) for (i = 1; i <= itlinesnr; i++) writel((unsigned)-1, gic_dist_addr + GICD_IGROUPRn + 4 * i);
- smp_set_core_boot_addr((unsigned long)_smp_pen, -1);
- smp_kick_all_cpus();
//smp_set_core_boot_addr((unsigned long)_smp_pen, -1);
//smp_kick_all_cpus();
printf("Before _nonsec_init() \r\n");
printf("cpsr =%x\n", read_cpsr());
printf("REGS %x \n", *(uint32_t*)0x10481100); /* call the non-sec switching code on this CPU also */ _nonsec_init();
printf("After _nonsec_init() \r\n");
printf("cpsr =%x\n", read_cpsr());
printf("REGS %x \n", *(uint32_t*)0x10481100);
return 0;
} diff --git a/include/configs/arndale.h b/include/configs/arndale.h index 515facf..53a1212 100644 --- a/include/configs/arndale.h +++ b/include/configs/arndale.h @@ -62,7 +62,6 @@ /* select serial console configuration */ #define CONFIG_BAUDRATE 115200 #define EXYNOS5_DEFAULT_UART_OFFSET 0x010000 -#define CONFIG_SILENT_CONSOLE
/* Console configuration */ #define CONFIG_CONSOLE_MUX @@ -249,4 +248,7 @@ /* Enable Time Command */ #define CONFIG_CMD_TIME
+/* Enable jump to hypervisor */ +#define CONFIG_ARMV7_VIRT +#define CONFIG_SMP_PEN_ADDR 0x0 #endif /* __CONFIG_H */
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