In the U-Boot-2009-03 porting notes (booting from Nandflash 1), we wrote the nandflash read driver and tried to read u-boot itself from nandflash to sdram, and finally light up led1 and led2 at the same time. Unfortunately, the result is not what we want. This article uses the openjtag debugging method to diagnose the problem (if you are not familiar with the debugging method, please refer to the U-Boot-2009-03 porting notes (debugging)).
Problem Discovery
We decompile the u-boot file and find that our program still calls the nand_init_ll function at 33f800090, so we set breakpoints at addresses 0x00000090 and 0x00000094, as shown in the figure:
What should I do if I find that the program runs away after 0x00000090? Let's take a look at the disassembly code of u-boot:
First look at 0x00000090 and find no problem, as shown in the figure:
Let's look at the nand_init_ll function itself and find that the function address is 0x33f8dcf0. If it is mapped to address 0, it should be 0x0000dcf0, which exceeds 4K and cannot be executed in sram. Knowing the cause of the problem, it is easy to solve.
Problem Solving
Open board/xinna2440/u-boot.lds and put the code of nand_op.c in the first 4k:
Recompile and burn, and find that both LED1 and LED2 are lit.
Previous article：U-Boot-2009-03 Porting Notes (Debugging)
Next article：U-Boot-2009-03 Porting Notes (Second Phase Porting Preparation)
Recommended ReadingLatest update time:2024-11-15 13:41
u-boot-2009.08 transplantation on mini2440 adds yaffs2 file system
Migration environment 1. Host environment: CentOS 5.5 under VMare, 1G memory. 2. Integrated development environment: Eclipse IDE 3. Compilation environment: arm-linux-gcc v4.4.3, arm-none-eabi-gcc v4.5.1. 4. Development board: mini2440, 2M nor flash, 128M nand flash. 5. u-boot version: u-boot-2009.08 5.1, Add Yaffs
[Microcontroller]
Detailed explanation of u-boot transplantation steps
1 Introduction to U-Boot
U-Boot, the full name of Universal Boot Loader, is an open source project that complies with the terms of the GPL. It has evolved from FADSROM, 8xxROM, and PPCBOOT. Its source code directory and compilation format are very similar to the Linux kernel. In fact, many U-Boot source codes ar
[Microcontroller]
[Linux bottom layer] U-boot debugging command usage tips
If you debug the driver at the uboot stage, you can make full use of the existing resources of uboot. This is more convenient and can speed up the development process. Only by standing on the shoulders of giants can you achieve twice the result with half the effort. 1. uboot provides operation commands to cover 2.
[Microcontroller]
U-boot kernel transplantation steps
Linux 3.3.5 system porting
Copy mach-smdk6410.c under arch/arm/mach-s3c6410/ to mach-my6410.c;
Open Kconfig under arch/arm/mach-s3c6410/ and make a menu item based on MACH_SMDK6410:
config MACH_MY6410
bool "MY6410"
select CPU_S3C6410
select SAMSUNG_DEV_ADC
select S3
[Microcontroller]
Chapter 13: Tiny4412 U-BOOT transplantation 13 DDR3 initialization source code analysis
Step 1: Set the clock Follow the steps in the previous chapter to explain: 1. DMC must assert and hold CKE to a logic lowlevel to provide stable power for memory device and then apply stable clock. Set up DMC. Since the clock has been set in clock_init_mytiny4412.S, there is no need to set it here. Just keep CKE at a
[Microcontroller]
Feiling OK6410 development board transplanted u-boot official latest version u-boot-2012.10.tar.bz2
Part 0 Preparatory knowledge 0.1 Key Parameters 0.1.1 Development Board Description OK6410 is a development board released by Feiling. There are currently two versions, OK6410-A and OK6410-B. I am currently using the former. The former has also been upgraded, so there are 128M ram and newer 256 memory versions. The na
[Microcontroller]
U-boot-2014.04 ported to MINI2440 (11) Analysis of the second boot phase
Let's review what u-boot does in the first stage of startup: First: Set the CPU to SVC mode Second: Turn off the watchdog Third: Turn off interrupts and sub-interrupts Step 4: Set the clock Fifth: MMU is turned off, cache and TLB are cleared, address alignment check is enabled, etc. Sixth: Initialize SDRAM
[Microcontroller]
18. U-boot workflow analysis -210
210 startup process:
Although there is a distinction between BL1 and BL2 in 2440 and 6410, the same is true for 210:
[Microcontroller]
- Popular Resources
- Popular amplifiers
In-depth understanding of BootLoader
u-Boot Basics
Latest Microcontroller Articles
- Learn ARM development(16)There are many things to learn about ARM, and interrupts are definitely something that needs to be learned. Since the CPU introduced interrupts, it has truly entered the multi-tasking system and greatly improved work efficiency. ...
- Learn ARM development(17)Because all embedded systems use interrupts, how does my S3C44B0 interrupt the process? Then I need to understand the whole process. To understand it in depth, the best way is to write a program ...
- Learn ARM development(18)Last time, we have learned about the interrupt handling process of ARM and how to set the interrupt function. So, does it work like this? The answer is no. Because S3C44B0 has several registers that control ...
- Embedded system debugging simulation toolAfter the embedded hardware system is designed, it needs to be debugged. Whether it is hardware debugging, software debugging or program solidification, debugging simulation tools are needed. ...
- A small question that has been bothering me recently has finally been solved~~Recently, I have not been able to understand the concept of drivers very well. Sometimes I can get a feel for it by combining some USB examples written by others, but because the ARM system does not directly explain the pins like the microcontroller ...
- Learn ARM development (1)
- Learn ARM development (2)
- Learn ARM development (4)
- Learn ARM development (6)
He Limin Column
Microcontroller and Embedded Systems Bible
Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
MoreSelected Circuit Diagrams
MorePopular Articles
- LED chemical incompatibility test to see which chemicals LEDs can be used with
- Application of ARM9 hardware coprocessor on WinCE embedded motherboard
- What are the key points for selecting rotor flowmeter?
- LM317 high power charger circuit
- A brief analysis of Embest's application and development of embedded medical devices
- Single-phase RC protection circuit
- stm32 PVD programmable voltage monitor
- Introduction and measurement of edge trigger and level trigger of 51 single chip microcomputer
- Improved design of Linux system software shell protection technology
- What to do if the ABB robot protection device stops
MoreDaily News
- How Lucid is overtaking Tesla with smaller motors
- Wi-Fi 8 specification is on the way: 2.4/5/6GHz triple-band operation
- Wi-Fi 8 specification is on the way: 2.4/5/6GHz triple-band operation
- Vietnam's chip packaging and testing business is growing, and supply-side fragmentation is splitting the market
- Vietnam's chip packaging and testing business is growing, and supply-side fragmentation is splitting the market
- Three steps to govern hybrid multicloud environments
- Three steps to govern hybrid multicloud environments
- Microchip Accelerates Real-Time Edge AI Deployment with NVIDIA Holoscan Platform
- Microchip Accelerates Real-Time Edge AI Deployment with NVIDIA Holoscan Platform
- Melexis launches ultra-low power automotive contactless micro-power switch chip
Guess you like
- What are the units of divergence and curl used in electromagnetic fields?
- Questions about the CAN bus ID part
- [Classic C language knowledge] Summary of C/C++ programming difficulties
- Is this a series voltage regulator circuit?
- Shenzhen Yezhan Electronics is looking for talents||Looking forward to your joining
- 【Atria AT32WB415 Series Bluetooth BLE 5.0 MCU】Serial port test
- The development board mobile station helps netizens successfully participate in the electronic competition!
- TechTest Elite Development Program - Answer questions and win gifts!
- Big summary! All sensor types are here
- A Bluetooth brake pedal monitor designed for Tesla owners
京公网安备 11010802033920号