| Message ID | 091150233acb0557a2ad3294d67b2adb6758670c.1693409184.git.geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ARM: shmobile: Reserve boot area when SMP is enabled | expand |
diff --git a/arch/arm/mach-shmobile/pm-rcar-gen2.c b/arch/arm/mach-shmobile/pm-rcar-gen2.c index 7447e5fd7ed41e99..3453d5733224df44 100644 --- a/arch/arm/mach-shmobile/pm-rcar-gen2.c +++ b/arch/arm/mach-shmobile/pm-rcar-gen2.c @@ -52,6 +52,11 @@ void __init rcar_gen2_pm_init(void) struct resource res; int error; + if (!request_mem_region(0, SZ_256K, "Boot Area")) { + pr_err("Failed to request boot area\n"); + return; + }; + for_each_of_cpu_node(np) { if (of_device_is_compatible(np, "arm,cortex-a15")) has_a15 = true;
CPU core bringup on R-Car Gen2 SoCs uses the Cortex-A7/A15 Boot Address Register to specify the boot area of the System CPU. With this enabled, when the System CPU accesses a physical address in the range from 0x0 to 0x3ffff, the top address bits are replaced by those specified in the SBAR register. Hence any device residing in the low 256 KiB of physical address space cannot be accessed. Prevent conflicts by reserving this memory region using request_mem_region(). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- arch/arm/mach-shmobile/pm-rcar-gen2.c | 5 +++++ 1 file changed, 5 insertions(+)