Hello, 2008/8/8 thaoth <[EMAIL PROTECTED]>:
> > I have questions about uboot below: > 1. Reallocating address of u-boot in booting process. > At the booting process, the address 0x80000000 is executed. This is memory > mapping address of Flash memory. and executable code of T-Monitor will be > executed. > > (1) ROM area memory map > In ROM, 8M byte(0x80000000-0x807FFFFF)of area is implemented. > Memory map of ROM area is shown as below. > > 0x80000000 +-------------------------------+ > | T-Monitor code | > |- - - - - - - - - - - - - - - -| > | | > 0x80010000 +-------------------------------+ > | ROM Information | > 0x80010080 +-------------------------------+ > |System configuration info | > | (SYSCONF / DEVCONF) | > |- - - - - - - - - - - - - - - -| > | | > 0x80020000 +-------------------------------+ > | T-Kernel code | > | | > +-------------------------------+ > | | > | User area | > | | > 0x80800000 +-------------------------------+ > > UBoot code will reflash into Flash memory at 0x80000000 address. This is > Flash Memory just readonly. Will UBoot reallocating (loading) binary code > into SDRAM at TEXT_BASE address. In T-Engine/Sh7727, this address will be > 0x8DFC0000 (Beginning address of SDRAM is 0x8C000000). Does UBoot > automatically reload this code into TEXT_BASE address? Yes, U-Boot designed working on SDRAM. In cpu/sh3/start.S, code of U-boot is copied from a flash bulb by memory and jump in memory. Because implementation of original U-boot comes to work as for this on memory, I match the SuperH with this implementation. > > Because Boot starting address will begin at Flash memory (0x80000000) and > T-Monitor (current boot loader) worked at this address. I don't know how > about UBoot. Does it reload Uboot into SDRAM (TEXT BASE) and run? > > 2. This is a great site for working SH with Linux. > http://www.superh-linux.org/platforms/index.html > Based on Reference board board/ms7720se, I changed the UBoot configuration > for T-Engine/SH7727 MS7727CP02 Kit. > > Many thanks to authors for your efforts > # Nobuhiro Iwamatsu <[EMAIL PROTECTED]> > # Yoshihiro Shimoda <[EMAIL PROTECTED]> > > I got a toolchain at > http://www.superh-linux.org/archive/bsp/sh7721_se/toolchain_sh3_gcc4.2.tar.gz > It supported "elf32-sh-linux" target. > And I also got toolchain from T-Engine forum and it support > "elf32-sh-tkernel" target. > > I don't know UBoot built with toolchain from http://www.superh-linux.org can > work on T-Engine platform or not? Sorry , I dont know it. The tool chain of http://www.superh-linux.org tests only elf32-sh-linux. > > 3. Debugging tool for U-Boot development. > Please tell me how to debug UBoot can work on board. Could you tell me > debugger tool for this purpose? Now I can reflash UBoot into Flash Memory > but I don't know how to check UBoot can work on it. Because porting have > others issues such as serial library, interrupt.... > > Could you recommend a tool can check it can work? > Sorry for stupid question. A developer has many cases to debug with ICE. When there is not ICE, We write in it at SDRAM with monitor and debug it on SDRAM. > > 4. Serial driver for UBoot on T-Engine/SH7727 board. > After make sure these configuration are correct setting (SDRAM adress, Flash > Memory). Next step is serial porting for UBoot. > > I think serial is basic peripheral and It can work with a small changes. But > Maybe I am wrong. Could you recommend the steps I could work on for serial > porting of UBoot? > > T-Engine has a serial library. I don't know how can reuse this library or > not? :( > There is two approach. 1. You delete content of Flash, and it is the method that only U-Boot uses. When you use this method, you come to need ICE. But this is very simple. 2. You call U-boot like an application from T-monitor, and to use. When you use this method, you will not need ICE. But you need Implementation serial function used T-monitor's library. I will ask a specialist in T-engine an opinion. I will send e-mail it if there is some information. Many Japanese companies become the long vacation from tomorrow. Because I am a holiday, an answer is not possible for approximately 2 weeks. Best regards, Nobuhiro -- Nobuhiro Iwamatsu ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
