diff --git a/arch/arm/src/common/arm_internal.h b/arch/arm/src/common/arm_internal.h
index 1c494459d7..658091cb59 100644
--- a/arch/arm/src/common/arm_internal.h
+++ b/arch/arm/src/common/arm_internal.h
@@ -428,7 +428,6 @@ void arm_restorefpu(const uint32_t *regs);
 /* Low level serial output **************************************************/
 
 void arm_lowputc(char ch);
-void up_puts(const char *str);
 void arm_lowputs(const char *str);
 
 #ifdef USE_SERIALDRIVER
diff --git a/arch/avr/src/common/up_internal.h b/arch/avr/src/common/up_internal.h
index 7b0f492b3d..593c1fcffb 100644
--- a/arch/avr/src/common/up_internal.h
+++ b/arch/avr/src/common/up_internal.h
@@ -114,7 +114,6 @@ void weak_function up_dma_initialize(void);
 #endif
 void up_sigdeliver(void);
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 void up_dumpstate(void);
 
diff --git a/arch/hc/src/common/up_internal.h b/arch/hc/src/common/up_internal.h
index 56ec7fa7b1..5f59ea1740 100644
--- a/arch/hc/src/common/up_internal.h
+++ b/arch/hc/src/common/up_internal.h
@@ -162,7 +162,6 @@ void rpmsg_serialinit(void);
 #endif
 
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 /* Memory configuration */
diff --git a/arch/mips/src/common/mips_internal.h b/arch/mips/src/common/mips_internal.h
index adfdb208d0..1abdb59731 100644
--- a/arch/mips/src/common/mips_internal.h
+++ b/arch/mips/src/common/mips_internal.h
@@ -184,7 +184,6 @@ void up_copystate(uint32_t *dest, uint32_t *src);
 
 /* Serial output */
 
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 /* Debug */
diff --git a/arch/or1k/src/common/up_internal.h b/arch/or1k/src/common/up_internal.h
index b8c336f5f7..6c18457024 100644
--- a/arch/or1k/src/common/up_internal.h
+++ b/arch/or1k/src/common/up_internal.h
@@ -269,7 +269,6 @@ uint32_t *or1k_syscall(uint32_t *regs);
 /* Low level serial output **************************************************/
 
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 #ifdef USE_SERIALDRIVER
diff --git a/arch/renesas/src/common/up_internal.h b/arch/renesas/src/common/up_internal.h
index b9b343859d..517108a3ec 100644
--- a/arch/renesas/src/common/up_internal.h
+++ b/arch/renesas/src/common/up_internal.h
@@ -141,7 +141,6 @@ void up_sigdeliver(void);
 void up_syscall(uint32_t *regs);
 void up_undefinedinsn(uint32_t *regs);
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 /* Defined in xyz_vectors.S */
diff --git a/arch/sparc/src/common/up_internal.h b/arch/sparc/src/common/up_internal.h
index 44dd6f3ab9..9b5bf2e361 100644
--- a/arch/sparc/src/common/up_internal.h
+++ b/arch/sparc/src/common/up_internal.h
@@ -181,7 +181,6 @@ void up_copystate(uint32_t *dest, uint32_t *src);
 
 /* Serial output */
 
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 /* Defined in drivers/lowconsole.c */
diff --git a/arch/x86/src/common/up_internal.h b/arch/x86/src/common/up_internal.h
index 06954b9ae8..83f5a75a07 100644
--- a/arch/x86/src/common/up_internal.h
+++ b/arch/x86/src/common/up_internal.h
@@ -178,7 +178,6 @@ void up_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
 void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
 void up_sigdeliver(void);
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 void up_syscall(uint32_t *regs);
diff --git a/arch/x86_64/src/common/up_internal.h b/arch/x86_64/src/common/up_internal.h
index a0682f4556..222d642f24 100644
--- a/arch/x86_64/src/common/up_internal.h
+++ b/arch/x86_64/src/common/up_internal.h
@@ -198,7 +198,6 @@ void up_fullcontextrestore(uint64_t *restoreregs) noreturn_function;
 void up_switchcontext(uint64_t *saveregs, uint64_t *restoreregs);
 void up_sigdeliver(void);
 void up_lowputc(char ch);
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 void up_restore_auxstate(struct tcb_s *rtcb);
 void up_checktasks(void);
diff --git a/arch/xtensa/src/common/xtensa.h b/arch/xtensa/src/common/xtensa.h
index 15dd5bd462..ac1f1c8311 100644
--- a/arch/xtensa/src/common/xtensa.h
+++ b/arch/xtensa/src/common/xtensa.h
@@ -233,7 +233,6 @@ void xtensa_copystate(uint32_t *dest, uint32_t *src);
 
 /* Serial output */
 
-void up_puts(const char *str);
 void up_lowputs(const char *str);
 
 /* Debug */
diff --git a/arch/z80/src/common/z80_internal.h b/arch/z80/src/common/z80_internal.h
index ae12dde58f..f4f8928613 100644
--- a/arch/z80/src/common/z80_internal.h
+++ b/arch/z80/src/common/z80_internal.h
@@ -111,10 +111,6 @@ void rpmsg_serialinit(void);
 #  define rpmsg_serialinit()
 #endif
 
-/* Low level string output */
-
-void up_puts(const char *str);
-
 /* Architecture specific hook into the timer interrupt handler */
 
 #ifdef CONFIG_ARCH_TIMERHOOK