Hi Matt,
On 18.01.22 18:46, Matt DeVillier wrote:
and attempting to boot from it:
Booting from Hard Disk...
sq 0x7aa77bdf next_sqe 0
sq 0x7aa77bdf commit_sqe 0
cq 0x7aa77bf1 head 0 -> 1
sq 0x7aa77bdf advanced to 1
ns 1 read lba 0+1: 0
Booting from 0000:7c00
sq 0x7aa77bdf next_sqe 1
sq 0x7aa77bdf commit_sqe 1
cq 0x7aa77bf1 head 1 -> 2
sq 0x7aa77bdf advanced to 2
ns 1 read lba 1+1: 0
sq 0x7aa77bdf next_sqe 2
sq 0x7aa77bdf commit_sqe 2
cq 0x7aa77bf1 head 2 -> 3
sq 0x7aa77bdf advanced to 3
read io: 00000000 00000000 00010003 40270002
This error means
"PRP Offset Invalid: The Offset field for a PRP entry is invalid. This
may occur when there is a PRP entry with a non-zero offset after the
first entry or when the Offset field in any PRP entry is not dword
aligned (i.e., bits 1:0 are not cleared to 00b)."
which points towards a misaligned PRP entry. The block size of this
request is 105 sectors (52.5kb), so it must be a PRPL. I don't see any
obvious code paths that would allow us to ever get into a misaligned
request here.
That said, while trying to understand what is happening here I did
stumble over a different weird effect: ns->prp1 gets overwritten with 0
by some interrupt handler. Could you please try the patch / hack below
and see if it fixes the problem for you? That way I at least know we're
hunting the same ghost.
If it doesn't help, I'll send you a debug patch that will give us some
more information about the PRP list SeaBIOS assembles.
Thanks,
Alex
---
diff --git a/src/hw/nvme.c b/src/hw/nvme.c
index f035fa2..99ad7a8 100644
--- a/src/hw/nvme.c
+++ b/src/hw/nvme.c
@@ -257,7 +257,7 @@ nvme_probe_ns(struct nvme_ctrl *ctrl, u32 ns_idx, u8
mdts)
goto free_buffer;
}
- struct nvme_namespace *ns = malloc_fseg(sizeof(*ns));
+ struct nvme_namespace *ns = malloc_low(sizeof(*ns));
if (!ns) {
warn_noalloc();
goto free_buffer;
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