diff options
Diffstat (limited to 'nuttx/configs/open1788')
-rw-r--r-- | nuttx/configs/open1788/README.txt | 44 | ||||
-rw-r--r-- | nuttx/configs/open1788/scripts/memory.ld | 27 |
2 files changed, 64 insertions, 7 deletions
diff --git a/nuttx/configs/open1788/README.txt b/nuttx/configs/open1788/README.txt index 59fc1f9d3..167c92f98 100644 --- a/nuttx/configs/open1788/README.txt +++ b/nuttx/configs/open1788/README.txt @@ -346,6 +346,50 @@ CONFIGURATION load objects twice to account for write failures. I have not yet found a simple foolproof way to reliably get the code into FLASH. + 4. Combining .hex files. If you plan to use the .hex files with your + debugger or FLASH utility, then you may need to combine the two hex + files into a single .hex file. Here is how you can do that. + + a. The 'tail' of the nuttx.hex file should look something like this + (with my comments added): + + $ tail nuttx.hex + # 00, data records + ... + :10 9DC0 00 01000000000800006400020100001F0004 + :10 9DD0 00 3B005A0078009700B500D400F300110151 + :08 9DE0 00 30014E016D0100008D + # 05, Start Linear Address Record + :04 0000 05 0800 0419 D2 + # 01, End Of File record + :00 0000 01 FF + + Use an editor such as vi to remove the 05 and 01 records. + + b. The 'head' of the nuttx_user.hex file should look something like + this (again with my comments added): + + $ head nuttx_user.hex + # 04, Extended Linear Address Record + :02 0000 04 0801 F1 + # 00, data records + :10 8000 00 BD89 01084C800108C8110208D01102087E + :10 8010 00 0010 00201C1000201C1000203C16002026 + :10 8020 00 4D80 01085D80010869800108ED83010829 + ... + + Nothing needs to be done here. The nuttx_user.hex file should + be fine. + + c. Combine the edited nuttx.hex and un-edited nuttx_user.hex + file to produce a single combined hex file: + + $ cat nuttx.hex nuttx_user.hex >combined.hex + + Then use the combined.hex file with the to write the FLASH image. + If you do this a lot, you will probably want to invest a little time + to develop a tool to automate these steps. + nsh --- Configures the NuttShell (nsh) located at examples/nsh. The diff --git a/nuttx/configs/open1788/scripts/memory.ld b/nuttx/configs/open1788/scripts/memory.ld index 5f23145d4..a43318279 100644 --- a/nuttx/configs/open1788/scripts/memory.ld +++ b/nuttx/configs/open1788/scripts/memory.ld @@ -34,15 +34,28 @@ ****************************************************************************/ /* The LPC1788 has 512Kb of FLASH beginning at address 0x0000:0000 and - * 96Kb of total SRAM: 64Kb of SRAM in the CPU block beginning at address - * 0x10000000 and 32Kb of Peripheral SRAM in two banks, 8Kb at addresses - * 0x20000000 bank0 first and 8kb at 0x20002000 at bank0 second. And 16Kb + * 96KB of total SRAM: 64KB of SRAM in the CPU block beginning at address + * 0x10000000 and 32Kb of Peripheral SRAM in two banks, 8KB at addresses + * 0x20000000 bank0 first and 8KB at 0x20002000 at bank0 second. And 16KB * at 0x20004000 on bank1. * - * For MPU support, the kernel-mode NuttX section is assumed to be 64Kb of - * FLASH and 4Kb of SRAM. That, of course, can be optimized as needed (See - * also configs/open1788/scripts/kernel-space.ld). A detailed memory map - * for the CPU SRAM region is as follows: + * For MPU support, the kernel-mode NuttX section is assumed to be 64KB of + * FLASH and 4KB of SRAM. That, of course, can be optimized as needed (See + * also configs/open1788/scripts/kernel-space.ld). + * + * Alignment of the user space FLASH partition is a critical factor: The + * user space FLASH partition will be spanned with a single region of size + * 2**n bytes. The alignment of the user-space region must be the same. As + * a consequence, as the user-space increases in size, the alignmment + * requirement also increases. + * + * This alignment requirement means that the largest user space FLASH region + * you can have will be 256KB at it would have to be positioned at + * 0x00400000. If you change this address, don't forget to chagne the + * CONFIG_NUTTX_USERSPACE configuration setting to match and to modify + * the check in kernel/userspace.c. + * + * A detailed memory map for the 64KB CPU SRAM region is as follows: * * 0x10000 0000: Kernel .data region. Typical size: 0.1KB * ------- ---- Kernel .bss region. Typical size: 1.8KB |