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arch/sim: Remove arch/sim/src/sim/sim_romgetc.c

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since it's no sense to support it on sim platform

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2022-12-17 17:33:05 +08:00 committed by Petro Karashchenko
parent 243983328a
commit 87f3681629
2 changed files with 0 additions and 75 deletions
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4
arch/sim/src/Makefile
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@ -156,10 +156,6 @@ ifeq ($(CONFIG_FS_FAT),y)
STDLIBS += -lz STDLIBS += -lz
endif endif
ifeq ($(CONFIG_ARCH_ROMGETC),y)
CSRCS += sim_romgetc.c
endif
ifeq ($(CONFIG_SIM_NETDEV_TAP),y) ifeq ($(CONFIG_SIM_NETDEV_TAP),y)
CSRCS += sim_netdriver.c CSRCS += sim_netdriver.c
ifneq ($(CONFIG_WINDOWS_CYGWIN),y) ifneq ($(CONFIG_WINDOWS_CYGWIN),y)

71
arch/sim/src/sim/sim_romgetc.c
View File

@ -1,71 +0,0 @@
/****************************************************************************
* arch/sim/src/sim/sim_romgetc.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_romgetc
*
* Description:
* In Harvard architectures, data accesses and instruction accesses occur
* on different buses, perhaps concurrently. All data accesses are
* performed on the data bus unless special machine instructions are
* used to read data from the instruction address space. Also, in the
* typical MCU, the available SRAM data memory is much smaller that the
* non-volatile FLASH instruction memory. So if the application requires
* many constant strings, the only practical solution may be to store
* those constant strings in FLASH memory where they can only be accessed
* using architecture-specific machine instructions.
*
* A similar case is where strings are retained in "external" memory such
* as EEPROM or serial FLASH. This case is similar only in that again
* special operations are required to obtain the string data; it cannot
* be accessed directly from a string pointer.
*
* If CONFIG_ARCH_ROMGETC is defined, then the architecture logic must
* export the function up_romgetc(). up_romgetc() will simply read one
* byte of data from the instruction space.
*
* If CONFIG_ARCH_ROMGETC, certain C stdio functions are effected: (1)
* All format strings in printf, fprintf, sprintf, etc. are assumed to
* lie in FLASH (string arguments for %s are still assumed to reside in
* SRAM). And (2), the string argument to puts and fputs is assumed to
* reside in FLASH. Clearly, these assumptions may have to modified for
* the particular needs of your environment. There is no
* "one-size-fits-all" solution for this problem.
*
****************************************************************************/
char up_romgetc(const char *ptr)
{
/* This is basically a No-Op if enabled in the simulation environment */
return *ptr;
}