* [PATCH] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support
@ 2026-08-23 22:13 chalianis1
2026-08-24 6:58 ` Ahmad Fatoum
2026-08-24 7:37 ` Sascha Hauer
0 siblings, 2 replies; 3+ messages in thread
From: chalianis1 @ 2026-08-23 22:13 UTC (permalink / raw)
To: s.hauer; +Cc: barebox, Chali Anis
From: Chali Anis <chalianis1@gmail.com>
Add a DEBUG_RPI4_UART choice for low-level debugging on RaspberryPi 4
and CM4 boards via the PL011 UART (uart0), for setups where the
disable-bt overlay routes it onto the GPIO header pins instead of the
mini UART. Mirrors the existing RPi1/RPi2-3 PL011 debug_ll support:
firmware configures the UART, so debug_ll_init() is a no-op.
Assisted-by: Claude Sonnet 5
Signed-off-by: Chali Anis <chalianis1@gmail.com>
---
common/Kconfig.debug_ll | 10 ++++++++++
include/mach/bcm283x/debug_ll.h | 10 ++++++++++
include/mach/bcm283x/platform.h | 1 +
3 files changed, 21 insertions(+)
diff --git a/common/Kconfig.debug_ll b/common/Kconfig.debug_ll
index 8445b4be0872..5a28dc4a61e7 100644
--- a/common/Kconfig.debug_ll
+++ b/common/Kconfig.debug_ll
@@ -275,6 +275,16 @@ config DEBUG_RPI2_3_UART
Say Y here if you want low-level debugging support on
RaspberryPi 2 and 3 boards.
+config DEBUG_RPI4_UART
+ bool "RaspberryPi 4 PL011 UART"
+ depends on ARCH_BCM283X
+ select DEBUG_BCM283X_UART
+ help
+ Say Y here if you want low-level debugging support on
+ RaspberryPi 4 / CM4 boards using the PL011 UART (uart0),
+ e.g. when the disable-bt overlay routes it onto the GPIO
+ header pins instead of the mini UART.
+
config DEBUG_RPI3_MINI_UART
bool "RaspberryPi 3 mini UART"
depends on ARCH_BCM283X
diff --git a/include/mach/bcm283x/debug_ll.h b/include/mach/bcm283x/debug_ll.h
index a6a3b8f08856..3f2d5ddc9857 100644
--- a/include/mach/bcm283x/debug_ll.h
+++ b/include/mach/bcm283x/debug_ll.h
@@ -40,6 +40,16 @@ static inline void debug_ll_init(void)
#define DEBUG_LL_UART_ADDR BCM2836_PL011_BASE
#include <debug_ll/pl011.h>
+#elif defined CONFIG_DEBUG_RPI4_UART
+
+static inline void debug_ll_init(void)
+{
+ /* Configured by ROM */
+}
+
+#define DEBUG_LL_UART_ADDR BCM2711_PL011_BASE
+#include <debug_ll/pl011.h>
+
#elif defined CONFIG_DEBUG_RPI3_MINI_UART
static inline uint8_t debug_ll_read_reg(void __iomem *base, int reg)
diff --git a/include/mach/bcm283x/platform.h b/include/mach/bcm283x/platform.h
index b957ac8de35e..54d8b38bd8ed 100644
--- a/include/mach/bcm283x/platform.h
+++ b/include/mach/bcm283x/platform.h
@@ -32,6 +32,7 @@
#define BCM2835_PL011_BASE 0x20201000
#define BCM2836_PL011_BASE 0x3f201000UL
+#define BCM2711_PL011_BASE 0xfe201000UL
#define BCM2835_MINIUART_BASE 0x20215040
#define BCM2836_MINIUART_BASE 0x3f215040UL
#define BCM2711_MINIUART_BASE 0xfe215040UL
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support
2026-08-23 22:13 [PATCH] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support chalianis1
@ 2026-08-24 6:58 ` Ahmad Fatoum
2026-08-24 7:37 ` Sascha Hauer
1 sibling, 0 replies; 3+ messages in thread
From: Ahmad Fatoum @ 2026-08-24 6:58 UTC (permalink / raw)
To: chalianis1, s.hauer; +Cc: barebox
On 8/24/26 12:13 AM, chalianis1@gmail.com wrote:
> From: Chali Anis <chalianis1@gmail.com>
>
> Add a DEBUG_RPI4_UART choice for low-level debugging on RaspberryPi 4
> and CM4 boards via the PL011 UART (uart0), for setups where the
> disable-bt overlay routes it onto the GPIO header pins instead of the
> mini UART. Mirrors the existing RPi1/RPi2-3 PL011 debug_ll support:
> firmware configures the UART, so debug_ll_init() is a no-op.
>
> Assisted-by: Claude Sonnet 5
> Signed-off-by: Chali Anis <chalianis1@gmail.com>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> common/Kconfig.debug_ll | 10 ++++++++++
> include/mach/bcm283x/debug_ll.h | 10 ++++++++++
> include/mach/bcm283x/platform.h | 1 +
> 3 files changed, 21 insertions(+)
>
> diff --git a/common/Kconfig.debug_ll b/common/Kconfig.debug_ll
> index 8445b4be0872..5a28dc4a61e7 100644
> --- a/common/Kconfig.debug_ll
> +++ b/common/Kconfig.debug_ll
> @@ -275,6 +275,16 @@ config DEBUG_RPI2_3_UART
> Say Y here if you want low-level debugging support on
> RaspberryPi 2 and 3 boards.
>
> +config DEBUG_RPI4_UART
> + bool "RaspberryPi 4 PL011 UART"
> + depends on ARCH_BCM283X
> + select DEBUG_BCM283X_UART
> + help
> + Say Y here if you want low-level debugging support on
> + RaspberryPi 4 / CM4 boards using the PL011 UART (uart0),
> + e.g. when the disable-bt overlay routes it onto the GPIO
> + header pins instead of the mini UART.
> +
> config DEBUG_RPI3_MINI_UART
> bool "RaspberryPi 3 mini UART"
> depends on ARCH_BCM283X
> diff --git a/include/mach/bcm283x/debug_ll.h b/include/mach/bcm283x/debug_ll.h
> index a6a3b8f08856..3f2d5ddc9857 100644
> --- a/include/mach/bcm283x/debug_ll.h
> +++ b/include/mach/bcm283x/debug_ll.h
> @@ -40,6 +40,16 @@ static inline void debug_ll_init(void)
> #define DEBUG_LL_UART_ADDR BCM2836_PL011_BASE
> #include <debug_ll/pl011.h>
>
> +#elif defined CONFIG_DEBUG_RPI4_UART
> +
> +static inline void debug_ll_init(void)
> +{
> + /* Configured by ROM */
> +}
> +
> +#define DEBUG_LL_UART_ADDR BCM2711_PL011_BASE
> +#include <debug_ll/pl011.h>
> +
> #elif defined CONFIG_DEBUG_RPI3_MINI_UART
>
> static inline uint8_t debug_ll_read_reg(void __iomem *base, int reg)
> diff --git a/include/mach/bcm283x/platform.h b/include/mach/bcm283x/platform.h
> index b957ac8de35e..54d8b38bd8ed 100644
> --- a/include/mach/bcm283x/platform.h
> +++ b/include/mach/bcm283x/platform.h
> @@ -32,6 +32,7 @@
>
> #define BCM2835_PL011_BASE 0x20201000
> #define BCM2836_PL011_BASE 0x3f201000UL
> +#define BCM2711_PL011_BASE 0xfe201000UL
> #define BCM2835_MINIUART_BASE 0x20215040
> #define BCM2836_MINIUART_BASE 0x3f215040UL
> #define BCM2711_MINIUART_BASE 0xfe215040UL
>
--
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31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support
2026-08-23 22:13 [PATCH] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support chalianis1
2026-08-24 6:58 ` Ahmad Fatoum
@ 2026-08-24 7:37 ` Sascha Hauer
1 sibling, 0 replies; 3+ messages in thread
From: Sascha Hauer @ 2026-08-24 7:37 UTC (permalink / raw)
To: chalianis1; +Cc: barebox
On Mon, 24 Aug 2026 00:13:29 +0200, chalianis1@gmail.com wrote:
> Add a DEBUG_RPI4_UART choice for low-level debugging on RaspberryPi 4
> and CM4 boards via the PL011 UART (uart0), for setups where the
> disable-bt overlay routes it onto the GPIO header pins instead of the
> mini UART. Mirrors the existing RPi1/RPi2-3 PL011 debug_ll support:
> firmware configures the UART, so debug_ll_init() is a no-op.
>
>
> [...]
Applied, thanks!
[1/1] bcm283x: debug_ll: add RaspberryPi 4 PL011 UART support
https://git.pengutronix.de/cgit/barebox/commit/?id=4836941756bb (link may not be stable)
Best regards,
--
Sascha Hauer <s.hauer@pengutronix.de>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2026-08-24 7:37 ` Sascha Hauer
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