imx233: always boost in bootloader
Many imx233 targets boot in a very low performance mode, typically cpu and
dram at 24MHz. This results in very slow boots and very unstable USB
bootloader mode. Since cpu frequency scaling is disabled in bootloader in
rockbox, always make the frequency scaling code available and boost at boot
time.
Change-Id: Ie96623c00f7c4cd9a377b84dcb14b772558cfa4d
diff --git a/bootloader/imx233.c b/bootloader/imx233.c
index ebd67ce..79e5708 100644
--- a/bootloader/imx233.c
+++ b/bootloader/imx233.c
@@ -141,6 +141,11 @@
system_init();
kernel_init();
+ /* some ixm233 targets needs this because the cpu and/or memory is clocked
+ * at 24MHz, resulting in terribly slow boots and unusable usb mode.
+ * While we are at it, clock at maximum speed to minimise boot time. */
+ imx233_set_cpu_frequency(CPUFREQ_MAX);
+
power_init();
enable_irq();
diff --git a/firmware/target/arm/imx233/system-imx233.c b/firmware/target/arm/imx233/system-imx233.c
index 3f751a8..44d6f0e 100644
--- a/firmware/target/arm/imx233/system-imx233.c
+++ b/firmware/target/arm/imx233/system-imx233.c
@@ -192,7 +192,6 @@
#endif
}
-#ifdef HAVE_ADJUSTABLE_CPU_FREQ
struct cpufreq_profile_t
{
/* key */
@@ -219,7 +218,7 @@
#define NR_CPU_PROFILES ((int)(sizeof(cpu_profiles)/sizeof(cpu_profiles[0])))
-void set_cpu_frequency(long frequency)
+void imx233_set_cpu_frequency(long frequency)
{
/* don't change the frequency if it is useless (changes are expensive) */
if(cpu_frequency == frequency)
@@ -277,6 +276,12 @@
/* update frequency */
cpu_frequency = frequency;
}
+
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
+void set_cpu_frequency(long frequency)
+{
+ return imx233_set_cpu_frequency(frequency);
+}
#endif
void imx233_enable_usb_controller(bool enable)
diff --git a/firmware/target/arm/imx233/system-target.h b/firmware/target/arm/imx233/system-target.h
index 407369a..33e8f12 100644
--- a/firmware/target/arm/imx233/system-target.h
+++ b/firmware/target/arm/imx233/system-target.h
@@ -53,6 +53,8 @@
void power_off(void);
void imx233_enable_usb_controller(bool enable);
void imx233_enable_usb_phy(bool enable);
+// NOTE: this is available even if HAVE_ADJUSTABLE_CPU_FREQ is undef
+void imx233_set_cpu_frequency(long frequency);
void udelay(unsigned usecs);