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[Qemu-devel] [Bug 1806824] Re: SIE-200 (TrustZone) MPC: BLK_MAX returns

From: Peter Maydell
Subject: [Qemu-devel] [Bug 1806824] Re: SIE-200 (TrustZone) MPC: BLK_MAX returns an incorrect value
Date: Thu, 13 Dec 2018 18:35:51 -0000

Thanks for the bug report and the test program. The fix seems straightforward 
-- just adjust what we return for the register value. I've sent a patch:

** Changed in: qemu
       Status: New => In Progress

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  SIE-200 (TrustZone) MPC: BLK_MAX returns an incorrect value

Status in QEMU:
  In Progress

Bug description:
  $ qemu-system-arm --version
  QEMU emulator version 3.0.92 (v3.1.0-rc2-31-gd522fba244)

  Arm SIE-200 Technical Reference Manual describes that BLK_MAX
  indicates the maximum value of "block based index register" (BLK_IDX).
  For example, the value 1 would indicate that BLK_IDX can be 0 or 1.
  According to my experiments, the AN505 FPGA image apparently follows
  this behavior.

  In the current implementation of QEMU, it appears to indicate the
  number of possible values for BLK_IDX, i.e., one plus the value it's
  supposed to return.

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