Re: [seL4] SDHC driver in Sabre Lite

Hi Oak, I don't suppose that any of those calls are returning errors? DMA is optional for the SDHC. It has been a while since I looked at the code, but I believe that passing 0 as the paddr will prevent the driver from using DMA. Of course, this is not a solution to your problem, but it could eliminate one point of failure as you could allocate a buffer with malloc isntead. - Alex On Tue, 2016-10-18 at 17:28 -0700, Norrathep Rattanavipanon wrote:

So I use the following code to create a new buffer for vaddr and paddr : void *vaddr = vspace_new_pages(&vspace, seL4_AllRights, 1, seL4PageBits);

seL4_CPtr frame_cap = vsapce_get_cap(&vspace, vaddr); seL4_ARM_Page_GetAddress_t gaddr = seL4_ARCH_Page_GetAddress(frame_cap);

uintptr_t paddr = (uintptr_t) gaddr.paddr;

long read_len = mmc_block_read(*mmc_card, 0x5, 1, vaddr, paddr, NULL, NULL); but the code is still stuck in mmc_block_read function. Anything I might be missing here? Thanks for the help, Oak

On Fri, Oct 14, 2016 at 11:06 AM, Norrathep Rattanavipanon wrote: Ah I see. That might be a problem. I thought that function will automatically build a mapping so I can use any vaddr,

Thanks Alex!

On Thu, Oct 13, 2016 at 8:38 PM, wrote: Hi Oak,

Your code looks fine, but where do these numbers come from?

void* vaddr = (void*) 0x1980000; uintptr_t paddr = (uintptr_t) 0x119a7000;

vaddr should be the virtual address of a buffer to which the block should be read, and paddr should be the physical address of this buffer.

- Alex

On Thu, 2016-10-13 at 17:33 -0700, Norrathep Rattanavipanon wrote: > Is there any example on how to use sdhc driver in > (https://github.com/SEL4PROJ/projects_libs/tree/master/libsdhcdrivers)? > > > Currently, I'm struggling to read a block of data from micro-sd in > seL4. > I use the following code (assertions are omitted here for readability) > to instantiate the driver : > > > > > ps_io_mapper_t io_mapper = {0}; > error = sel4platsupport_new_io_mapper(simple, vspace, vka, > &io_mapper); > > ps_dma_man_t dma_man = {0}; > error = sel4utils_new_page_dma_alloc(&vka, &vspace, &dma_man); > > ps_io_ops_t io_ops = { > .io_mapper = io_mapper, > .dma_manager = dma_man > }; > > sdio_host_dev_t* dev = (sdio_host_dev_t*) malloc(sizeof(*dev)); > assert(dev != NULL); > memset(dev,0, sizeof(*dev)); > > > enum sdio_id id = sdio_default_id(); > error = sdio_init(id, &io_ops, dev); > > mmc_card_t* mmc_card = (mmc_card_t*) malloc(sizeof(*mmc_card)); > error = mmc_init(dev, &io_ops, mmc_card); > > > void* vaddr = (void*) 0x1980000; > > uintptr_t paddr = (uintptr_t) 0x119a7000; > > long read_len = mmc_block_read(*mmc_card, 0, 5, vaddr, paddr, NULL, > NULL); > > > > And the code's stuck in mmc_block_read function where interrupt status > (BRR and BWR) are never on. > > > Thanks in advance, > Oak > > > > > -- > Norrathep (Oak) Rattanavipanon > M.S. in Computer Science > University of California - Irvine

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-- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine

-- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine