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From: Konstantin Kletschke <konstantin.kletschke@inside-m2m.de>
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Subject: Re: [PATCH] ARM: beaglebone: add delay in lowlevel.c
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More like this?
On Wed, Jan 08, 2025 at 04:19:49PM +0100, Ahmad Fatoum wrote:
>
> It would be nice to have the comment more verbose. e.g. that this issue
> was observed on new Seeed-produced BBBs is an intersting info IMO.
arch/arm/boards/beaglebone/lowlevel.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/arm/boards/beaglebone/lowlevel.c b/arch/arm/boards/beaglebone/lowlevel.c
index 5dc49dfaaf..7dc338d03a 100644
--- a/arch/arm/boards/beaglebone/lowlevel.c
+++ b/arch/arm/boards/beaglebone/lowlevel.c
@@ -97,6 +97,12 @@ extern char __dtb_z_am335x_boneblack_start[];
extern char __dtb_z_am335x_bone_common_start[];
extern char __dtb_z_am335x_bone_start[];
+static void __udelay(int us)
+{
+ volatile int i;
+ for (i = 0; i < us; i++);
+}
+
/**
* @brief The basic entry point for board initialization.
*
@@ -135,6 +141,12 @@ static noinline int beaglebone_sram_init(void)
am33xx_enable_uart0_pin_mux();
omap_debug_ll_init();
putc_ll('>');
+ /*
+ * Some (~5%) Beaglebone Black received from SEEED in batches
+ * after autumn 2024 require a delay to be able to warm start
+ * after reset
+ */
+ __udelay(3000);
barebox_arm_entry(0x80000000, sdram_size, fdt);
}