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Initial RAM Disk

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Lee Lup Yuen 2023-07-21 12:09:49 +08:00
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@ -2533,9 +2533,7 @@ But NuttX crashes. Let's find out why...
# QEMU Semihosting in NuttX # QEMU Semihosting in NuttX
TODO NuttX crashes while booting on Star64 JH7110 SBC. From the Crash Dump above, [`mcause`](https://five-embeddev.com/riscv-isa-manual/latest/machine.html#sec:mcause) is 3: "Machine Software Interrupt".
From the Crash Dump above, [`mcause`](https://five-embeddev.com/riscv-isa-manual/latest/machine.html#sec:mcause) is 3: "Machine Software Interrupt".
Exception Program Counter `0x4020` `0434` is in RISC-V Semihosting `smh_call`... Exception Program Counter `0x4020` `0434` is in RISC-V Semihosting `smh_call`...
@ -2577,9 +2575,7 @@ So NuttX crashes on Star64 because it's trying to read `/system/bin/init` via Se
Let's disable Semihosting and replace by Initial RAM Disk and ROMFS. Let's disable Semihosting and replace by Initial RAM Disk and ROMFS.
See https://github.com/apache/nuttx/issues/9501 (See https://github.com/apache/nuttx/issues/9501)
And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
Here's the Crash Dump after we disabled Semihosting... Here's the Crash Dump after we disabled Semihosting...
@ -2669,9 +2665,11 @@ dump_task: 1 1 100 RR Kthread --- Waiting Unlock 00000000000
# NuttX Apps Filesystem # NuttX Apps Filesystem
TODO _Where is `/system/bin/init`? Why is it loaded by NuttX over Semihosting?_
Where is `/system/bin/init`? `/system/bin/init` is needed for starting the NuttX Shell (and NuttX Apps) on Star64 JH7110 SBC.
We see it in the NuttX Build Configuration...
```text ```text
→ grep INIT .config → grep INIT .config
@ -2690,7 +2688,7 @@ CONFIG_PATH_INITIAL="/system/bin"
CONFIG_NSH_ARCHINIT=y CONFIG_NSH_ARCHINIT=y
``` ```
Which means that `../apps` is mounted as `/system`. Which says that `../apps` is mounted as `/system`, via Semihosting HostFS.
That's how `/system/bin/init` gets loaded over Semihosting... That's how `/system/bin/init` gets loaded over Semihosting...
@ -2770,25 +2768,21 @@ host_call: nbr=0x2, parm=0x80209190, size=8
/system/bin/init /system/bin/init
``` ```
We need to replicate this with Initial RAM Disk and ROMFS. Semihosting won't work on Star64 SBC. Let's replace this with Initial RAM Disk and ROMFS...
See https://github.com/apache/nuttx/issues/9501 (See https://github.com/apache/nuttx/issues/9501)
And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
# Initial RAM Disk for LiteX Arty-A7 # Initial RAM Disk for LiteX Arty-A7
TODO
Let's modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk (instead of Semihosting). Let's modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk (instead of Semihosting).
(So later we can replicate this on Star64) (So later we can replicate this on Star64 JH7110 SBC)
First we look at the Initial RAM Disk for LiteX Arty-A7... First we look at the Initial RAM Disk for LiteX Arty-A7...
[(About NuttX RAM Disks and ROM Disks)](https://cwiki.apache.org/confluence/plugins/servlet/mobile?contentId=139629548#content/view/139629548) [(About NuttX RAM Disks and ROM Disks)](https://cwiki.apache.org/confluence/plugins/servlet/mobile?contentId=139629548#content/view/139629548)
To generate the RAM Disk: [VexRISCV_SMP Core](https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html): To generate the RAM Disk, we run this command: [VexRISCV_SMP Core](https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html)
```bash ```bash
cd nuttx cd nuttx
@ -2797,7 +2791,7 @@ genromfs -f romfs.img -d ../apps/bin -V "NuttXBootVol"
[(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/) [(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/)
LiteX Memory Map: LiteX Memory Map says where the RAM Disk is loaded...
```text ```text
"romfs.img": "0x40C00000", "romfs.img": "0x40C00000",
@ -2805,7 +2799,7 @@ LiteX Memory Map:
"opensbi.bin": "0x40f00000" "opensbi.bin": "0x40f00000"
``` ```
LiteX Build Configuration: [knsh/defconfig](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/boards/risc-v/litex/arty_a7/configs/knsh/defconfig#L34) This is the LiteX Build Configuration for mounting the RAM Disk: [knsh/defconfig](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/boards/risc-v/litex/arty_a7/configs/knsh/defconfig#L34)
```bash ```bash
CONFIG_BOARDCTL_ROMDISK=y CONFIG_BOARDCTL_ROMDISK=y
@ -2827,14 +2821,14 @@ CONFIG_SYSTEM_NSH_PROGNAME="init"
CONFIG_TESTING_GETPRIME=y CONFIG_TESTING_GETPRIME=y
``` ```
From [NSH Start-Up Script](https://nuttx.apache.org/docs/latest/applications/nsh/nsh.html#nsh-start-up-script): According to [NSH Start-Up Script](https://nuttx.apache.org/docs/latest/applications/nsh/nsh.html#nsh-start-up-script):
```text ```text
CONFIG_DISABLE_MOUNTPOINT not set CONFIG_DISABLE_MOUNTPOINT not set
CONFIG_FS_ROMFS enabled CONFIG_FS_ROMFS enabled
``` ```
LiteX Startup: [litex_appinit.c](https://github.com/apache/nuttx/blob/master/boards/risc-v/litex/arty_a7/src/litex_appinit.c#L76-L103) The RAM Disk is mounted at LiteX Startup: [litex_appinit.c](https://github.com/apache/nuttx/blob/master/boards/risc-v/litex/arty_a7/src/litex_appinit.c#L76-L103)
```c ```c
void board_late_initialize(void) void board_late_initialize(void)
@ -2925,13 +2919,11 @@ Let's do the same to NuttX for QEMU...
# Modify NuttX QEMU to Load Initial RAM Disk # Modify NuttX QEMU to Load Initial RAM Disk
TODO
Now we can modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk instead of Semihosting. Now we can modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk instead of Semihosting.
(So later we can replicate this on Star64) (So later we can replicate this on Star64 JH7110 SBC)
We follow the steps from LiteX Arty-A7... We follow the steps from LiteX Arty-A7 (from the previous section)...
We build NuttX QEMU in Kernel Mode: [Build Steps](https://github.com/lupyuen2/wip-pinephone-nuttx/tree/master/boards/risc-v/qemu-rv/rv-virt) We build NuttX QEMU in Kernel Mode: [Build Steps](https://github.com/lupyuen2/wip-pinephone-nuttx/tree/master/boards/risc-v/qemu-rv/rv-virt)
@ -2948,7 +2940,7 @@ make import V=1
popd popd
``` ```
To generate the Initial RAM Disk `initrd`... We generate the Initial RAM Disk `initrd`...
```bash ```bash
cd nuttx cd nuttx
@ -2957,7 +2949,7 @@ genromfs -f initrd -d ../apps/bin -V "NuttXBootVol"
[(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/) [(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/)
To load Initial RAM Disk on QEMU: [‘virt’ Generic Virtual Platform (virt)](https://www.qemu.org/docs/master/system/riscv/virt.html#running-linux-kernel) This is how we load the Initial RAM Disk on QEMU: [‘virt’ Generic Virtual Platform (virt)](https://www.qemu.org/docs/master/system/riscv/virt.html#running-linux-kernel)
```bash ```bash
qemu-system-riscv64 \ qemu-system-riscv64 \
@ -3074,7 +3066,9 @@ void qemu_rv_kernel_mappings(void) {
memcpy((void *)__ramdisk_start, (void *)0x84000000, (size_t)__ramdisk_size); memcpy((void *)__ramdisk_start, (void *)0x84000000, (size_t)__ramdisk_size);
``` ```
Before making the above changes, here's the log for QEMU with Semihosting... [(Because somehow `map_region` crashes when we try to map 0x84000000)](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk/arch/risc-v/src/qemu-rv/qemu_rv_mm_init.c#L280-L287)
Before making the above changes, here's the log for QEMU Kernel Mode with Semihosting...
```text ```text
+ genromfs -f initrd -d ../apps/bin -V NuttXBootVol + genromfs -f initrd -d ../apps/bin -V NuttXBootVol
@ -3101,7 +3095,7 @@ NuttShell (NSH) NuttX-12.0.3
nsh> nx_start: CPU0: Beginning Idle Loop nsh> nx_start: CPU0: Beginning Idle Loop
``` ```
Now we run it with Initial RAM Disk, without Semihosting... Now we run QEMU Kernel Mode with Initial RAM Disk, without Semihosting...
# Load Address Misaligned in NuttX ROMFS # Load Address Misaligned in NuttX ROMFS