[PATCH RFC v2 0/4] RISC-V: Add basic eMMC support for BeagleV Ahead

[Jisheng Zhang]

On Tue, Aug 29, 2023 at 08:19:53AM -0700, Drew Fustini wrote:
> On Tue, Aug 29, 2023 at 09:56:47AM +0800, Jiexun Wang wrote:
> > Date: Mon, 28 Aug 2023 23:05:35 +0800, Jisheng Zhang wrote:
> > >On Mon, Aug 28, 2023 at 12:40:16PM +0800, Jiexun Wang wrote:
> > >> Hello,
> > >> I tested the patch on my LicheePi 4A board.
> > >> It can successfully boot with eMMC, but when I use the eMMC more frequently - for instance:
> > >> 
> > >> $ while true; do /bin/dd if=/dev/zero of=bigfile bs=1024000 count=1024; done &
> > >> 
> > >> I encounter the following error:
> > >> 
> > >> sbi_trap_error: hart1: illegal instruction handler failed (error -2)
> > >
> > >> sbi_trap_error: hart1: mcause=0x0000000000000002 mtval=0x0000000060e2de4f
> > >> sbi_trap_error: hart1: mepc=0x000000000001897c mstatus=0x0000000a00001820
> > >> sbi_trap_error: hart1: ra=0x00000000000170f8 sp=0x000000000004adc8
> > >> sbi_trap_error: hart1: gp=0xffffffff8136ea90 tp=0xffffffd900228000
> > >> sbi_trap_error: hart1: s0=0x0000000000000000 s1=0x000000000004ae08
> > >> sbi_trap_error: hart1: a0=0x000000003f9aa9bc a1=0x0000000000000004
> > >> sbi_trap_error: hart1: a2=0x0000000000000000 a3=0x0000000000000000
> > >> sbi_trap_error: hart1: a4=0x0000000000042248 a5=0x00000000000170e5
> > >> sbi_trap_error: hart1: a6=0x0000000000000000 a7=0x0000000054494d45
> > >> sbi_trap_error: hart1: s2=0x000000000004aee8 s3=0x0000000000000000
> > >> sbi_trap_error: hart1: s4=0x000000000004ae08 s5=0x0000000000000000
> > >> sbi_trap_error: hart1: s6=0xffffffff813aa240 s7=0x0000000000000080
> > >> sbi_trap_error: hart1: s8=0xffffffff80a1b5f0 s9=0x0000000000000000
> > >> sbi_trap_error: hart1: s10=0xffffffd9fef5d380 s11=0xffffffff81290a80
> > >> sbi_trap_error: hart1: t0=0x0000000a00000820 t1=0x0000000000000000
> > >> sbi_trap_error: hart1: t2=0xffffffff80c00318 t3=0x0000000000000001
> > >> sbi_trap_error: hart1: t4=0x0000000000000330 t5=0x0000000000000001
> > >> sbi_trap_error: hart1: t6=0x0000000000040000
> > >> 
> > >> My kernel version is v6.5-rc3.
> > >> My OpenSBI version is 1.3.
> > >> I tried to use other versions of OpenSBI, yet the problem persists. 
> > >> Is there a possibility of any underlying bug? Your insights into this would be greatly appreciated.
> > >
> > >
> > >Can you plz try below opensbi?
> > 
> > I tried the OpenSBI you provided and the issue didn't recur.
> > I conducted stress test about 30 minutes and the system appears to be functioning very well.
> > Thank you so much for helping me resolve this problem.
> 
> That's great!
> 
> Jisheng - are these the commits that fix the error?
> 
> d98da90a19b5 ("lib: sbi_illegal_insn: Fix FENCE.TSO emulation infinite trap loop")
> 39d1e698c975 ("lib: sbi_illegal_insn: Add emulation for fence.tso")
> 

These two commits have been in upstream OpenSBI, so there
must be something to be patched/fixed in the upstream OpenSBI, but I have not
yet bisected the upstream OpenSBI to find the root cause.
This issue is on my TODO list.