Hi Martin,
I really appreciate your kind response.
I just want to let only Genode to access the ESDHC and run tz_vmm
successfully without generating data abort exception . Can i disable the
ESDHC in the Linux kernel so that the Linux (unsecure side) can't request
to access the ESDHC. Please let me know if it is possible and how i can do
that. Or is there something to do this in Genode configuration?
Thanks,
On Thu, Nov 19, 2015 at 11:19 AM, Martin Stein <martin.st...@genode-labs.com
> wrote:
> Hey Joseph,
>
> Am 19.11.2015 um 01:58 schrieb Joseph Lee:
> > the problem was that the SDHC driver timed out which then generates the
> > "Completion host signal timed out" error message. It is solved by
> replacing
> >
> > if (!wait_for<Irqstat>(irq_goal, _delayer)) {
> > PERR("Completion host signal timed out");
> >
> > in [1] with
> >
> > if (!wait_for<Irqstat>(irq_goal, _delayer, 3000)) {
> > PERR("Completion host signal timed out %x", read<Irqstat>());
>
> Thank you for the info :)
>
> > I tried to modify trustzone settings for ESDHC MMIO and IRQs and make
> > run/tz_vmm. it hangs when the Linux kernel tries to access the sd_card
> > and displays the following error message.
> >
> > mxsdhci: MXC Secure Digital Host Controller Interface driver
> > mxsdhci: MXC SDHCI Controller Driver.
> > [init -> tz_vmm] Cpu state:
> > [init -> tz_vmm] Register Virt Phys
> > [init -> tz_vmm] ---------------------------------
> > [init -> tz_vmm] r0 = c5bc6e00 [85bc6e00]
> > [init -> tz_vmm] r1 = 00000001 [00000000]
> > [init -> tz_vmm] r2 = c030aef8 [8030aef8]
> > [init -> tz_vmm] r3 = c690e000 [50004000]
> > [init -> tz_vmm] r4 = c5bc6e00 [85bc6e00]
> > [init -> tz_vmm] r5 = c5bc6e00 [85bc6e00]
> > [init -> tz_vmm] r6 = 00000000 [00000000]
> > [init -> tz_vmm] r7 = 00000001 [00000000]
> > [init -> tz_vmm] r8 = c088cf50 [8088cf50]
> > [init -> tz_vmm] r9 = 00000000 [00000000]
> > [init -> tz_vmm] r10 = 00000001 [00000000]
> > [init -> tz_vmm] r11 = c5b5b0c0 [85b5b0c0]
> > [init -> tz_vmm] r12 = 00002000 [00000000]
> > [init -> tz_vmm] sp = 00000000 [00000000]
> > [init -> tz_vmm] lr = 00000000 [00000000]
> > [init -> tz_vmm] ip = c0309288 [80309288]
> > [init -> tz_vmm] cpsr = 20000013
> > [init -> tz_vmm] sp_und = c08e3978 [808e3978]
> > [init -> tz_vmm] lr_und = c08e3978 [808e3978]
> > [init -> tz_vmm] spsr_und = 00000000 [00000000]
> > [init -> tz_vmm] sp_svc = c5023ee8 [85023ee8]
> > [init -> tz_vmm] lr_svc = c030afd0 [8030afd0]
> > [init -> tz_vmm] spsr_svc = 60000013 [00000000]
> > [init -> tz_vmm] sp_abt = c08e396c [808e396c]
> > [init -> tz_vmm] lr_abt = c0038a20 [80038a20]
> > [init -> tz_vmm] spsr_abt = 20000093 [00000000]
> > [init -> tz_vmm] sp_irq = c08e3960 [808e3960]
> > [init -> tz_vmm] lr_irq = c0038a80 [80038a80]
> > [init -> tz_vmm] spsr_irq = 60000093 [00000000]
> > [init -> tz_vmm] sp_fiq = 00000000 [00000000]
> > [init -> tz_vmm] lr_fiq = 00000000 [00000000]
> > [init -> tz_vmm] spsr_fiq = 00000000 [00000000]
> > [init -> tz_vmm] ttbr0 = 85e34019
> > [init -> tz_vmm] ttbr1 = 80004019
> > [init -> tz_vmm] ttbrc = 00000000
> > [init -> tz_vmm] dfar = c690e02c [5000402c]
> > [init -> tz_vmm] exception = data_abort
> > [init -> tz_vmm] Could not handle data-abort will exit!
>
> As you configured your ESDHC secure, unsecure Linux consequently isn't
> allowed anymore to access it. If you want to let both Linux and Genode
> access the ESDHC you can use an SMC-based stub block driver in the
> unsecure world. You might have a look at [1] (unsecure sided driver) and
> [2] (secure sided back-end) as an inspiration. In this example, Genode
> secures the ESDHC in general but, via part_blk and tz_vmm, provides the
> second partition of an ESDHC medium to the Linux stub block driver.
>
> Cheers,
> Martin
>
> [1]
>
> https://github.com/m-stein/genode/commit/225f1fe1296da11b8304ebe55a4c23f6e29f9aa5
>
> repos/os/src/server/tz_vmm/include/block.h
> repos/os/src/server/tz_vmm/block.cc
>
> [2]
>
> https://github.com/m-stein/linux/commit/9418cc87ed26b6cd7c4ec66ba4bdc1f998cd5ccd
>
> drivers/block/genode.c
>
>
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