lupyuen/nuttx-star64
1
0
Fork 0
mirror of https://github.com/lupyuen/nuttx-star64.git synced 2025-01-12 20:58:32 +08:00
Code Issues Projects Releases Packages Wiki Activity Actions

Memory Map for RAM Disk

Browse source
This commit is contained in:
Lee Lup Yuen 2023-10-11 12:28:37 +08:00
parent aaf3769a8e
commit 61dae4be0d
1 changed files with 27 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
README.md
View file

@ -3594,9 +3594,34 @@ TODO: Why no shell?
TODO: Why `nx_start_application: ret=3`?
TODO: Check User Address Space
# Memory Map for RAM Disk
TODO: Boot from MicroSD with Initial RAM Disk
Note that the RAM Disk is mapped into the Page Heap...
From https://github.com/apache/nuttx/blob/master/boards/risc-v/jh7110/star64/scripts/ld.script
```text
MEMORY
{
kflash (rx) : ORIGIN = 0x40200000, LENGTH = 2048K /* w/ cache */
ksram (rwx) : ORIGIN = 0x40400000, LENGTH = 2048K /* w/ cache */
pgram (rwx) : ORIGIN = 0x40600000, LENGTH = 4096K /* w/ cache */
ramdisk (rwx) : ORIGIN = 0x40A00000, LENGTH = 16M /* w/ cache */
}
/* Note: Page Heap includes RAM Disk */
__pgheap_start = ORIGIN(pgram);
__pgheap_size = LENGTH(pgram) + LENGTH(ramdisk);
/* Application ramdisk */
__ramdisk_start = ORIGIN(ramdisk);
__ramdisk_size = LENGTH(ramdisk);
__ramdisk_end = ORIGIN(ramdisk) + LENGTH(ramdisk);
```
TODO: How do we exclude the RAM Disk from being allocated to NuttX Apps?
# No UART Output from NuttX Shell