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Initial RAM Disk
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52
README.md
52
README.md
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@ -2533,9 +2533,7 @@ But NuttX crashes. Let's find out why...
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# QEMU Semihosting in NuttX
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TODO
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From the Crash Dump above, [`mcause`](https://five-embeddev.com/riscv-isa-manual/latest/machine.html#sec:mcause) is 3: "Machine Software Interrupt".
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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".
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Exception Program Counter `0x4020` `0434` is in RISC-V Semihosting `smh_call`...
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@ -2577,9 +2575,7 @@ So NuttX crashes on Star64 because it's trying to read `/system/bin/init` via Se
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Let's disable Semihosting and replace by Initial RAM Disk and ROMFS.
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See https://github.com/apache/nuttx/issues/9501
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And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
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(See https://github.com/apache/nuttx/issues/9501)
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Here's the Crash Dump after we disabled Semihosting...
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@ -2669,9 +2665,11 @@ dump_task: 1 1 100 RR Kthread --- Waiting Unlock 00000000000
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# NuttX Apps Filesystem
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TODO
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_Where is `/system/bin/init`? Why is it loaded by NuttX over Semihosting?_
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Where is `/system/bin/init`?
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`/system/bin/init` is needed for starting the NuttX Shell (and NuttX Apps) on Star64 JH7110 SBC.
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We see it in the NuttX Build Configuration...
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```text
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→ grep INIT .config
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@ -2690,7 +2688,7 @@ CONFIG_PATH_INITIAL="/system/bin"
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CONFIG_NSH_ARCHINIT=y
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```
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Which means that `../apps` is mounted as `/system`.
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Which says that `../apps` is mounted as `/system`, via Semihosting HostFS.
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That's how `/system/bin/init` gets loaded over Semihosting...
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@ -2770,25 +2768,21 @@ host_call: nbr=0x2, parm=0x80209190, size=8
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/system/bin/init
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```
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We need to replicate this with Initial RAM Disk and ROMFS.
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Semihosting won't work on Star64 SBC. Let's replace this with Initial RAM Disk and ROMFS...
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See https://github.com/apache/nuttx/issues/9501
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And https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html
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(See https://github.com/apache/nuttx/issues/9501)
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# Initial RAM Disk for LiteX Arty-A7
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TODO
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Let's modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk (instead of Semihosting).
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(So later we can replicate this on Star64)
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(So later we can replicate this on Star64 JH7110 SBC)
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First we look at the Initial RAM Disk for LiteX Arty-A7...
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[(About NuttX RAM Disks and ROM Disks)](https://cwiki.apache.org/confluence/plugins/servlet/mobile?contentId=139629548#content/view/139629548)
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To generate the RAM Disk: [VexRISCV_SMP Core](https://nuttx.apache.org/docs/latest/platforms/risc-v/litex/cores/vexriscv_smp/index.html):
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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)
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```bash
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cd nuttx
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@ -2797,7 +2791,7 @@ genromfs -f romfs.img -d ../apps/bin -V "NuttXBootVol"
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[(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/)
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LiteX Memory Map:
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LiteX Memory Map says where the RAM Disk is loaded...
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```text
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"romfs.img": "0x40C00000",
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@ -2805,7 +2799,7 @@ LiteX Memory Map:
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"opensbi.bin": "0x40f00000"
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```
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LiteX Build Configuration: [knsh/defconfig](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/boards/risc-v/litex/arty_a7/configs/knsh/defconfig#L34)
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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)
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```bash
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CONFIG_BOARDCTL_ROMDISK=y
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@ -2827,14 +2821,14 @@ CONFIG_SYSTEM_NSH_PROGNAME="init"
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CONFIG_TESTING_GETPRIME=y
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```
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From [NSH Start-Up Script](https://nuttx.apache.org/docs/latest/applications/nsh/nsh.html#nsh-start-up-script):
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According to [NSH Start-Up Script](https://nuttx.apache.org/docs/latest/applications/nsh/nsh.html#nsh-start-up-script):
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```text
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CONFIG_DISABLE_MOUNTPOINT not set
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CONFIG_FS_ROMFS enabled
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```
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LiteX Startup: [litex_appinit.c](https://github.com/apache/nuttx/blob/master/boards/risc-v/litex/arty_a7/src/litex_appinit.c#L76-L103)
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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)
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```c
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void board_late_initialize(void)
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@ -2925,13 +2919,11 @@ Let's do the same to NuttX for QEMU...
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# Modify NuttX QEMU to Load Initial RAM Disk
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TODO
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Now we can modify NuttX for QEMU to mount the Apps Filesystem from an Initial RAM Disk instead of Semihosting.
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(So later we can replicate this on Star64)
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(So later we can replicate this on Star64 JH7110 SBC)
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We follow the steps from LiteX Arty-A7...
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We follow the steps from LiteX Arty-A7 (from the previous section)...
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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)
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@ -2948,7 +2940,7 @@ make import V=1
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popd
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```
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To generate the Initial RAM Disk `initrd`...
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We generate the Initial RAM Disk `initrd`...
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```bash
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cd nuttx
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@ -2957,7 +2949,7 @@ genromfs -f initrd -d ../apps/bin -V "NuttXBootVol"
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[(About `genromfs`)](https://www.systutorials.com/docs/linux/man/8-genromfs/)
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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)
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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)
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```bash
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qemu-system-riscv64 \
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@ -3074,7 +3066,9 @@ void qemu_rv_kernel_mappings(void) {
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memcpy((void *)__ramdisk_start, (void *)0x84000000, (size_t)__ramdisk_size);
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```
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Before making the above changes, here's the log for QEMU with Semihosting...
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[(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)
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Before making the above changes, here's the log for QEMU Kernel Mode with Semihosting...
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```text
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+ genromfs -f initrd -d ../apps/bin -V NuttXBootVol
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@ -3101,7 +3095,7 @@ NuttShell (NSH) NuttX-12.0.3
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nsh> nx_start: CPU0: Beginning Idle Loop
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```
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Now we run it with Initial RAM Disk, without Semihosting...
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Now we run QEMU Kernel Mode with Initial RAM Disk, without Semihosting...
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# Load Address Misaligned in NuttX ROMFS
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