Hi,
>
> I am new to linux-kernel and am using kernel 3.1.6 and working on
> arm-SemiHosting(through USB) drivers.
>
> We are using SemiHosting to exchange/transfer data from the arm-board to
> the PC.
What is SemiHosting?>
> I am new to linux-kernel and am using kernel 3.1.6 and working on
> arm-SemiHosting(through USB) drivers.
>
> We are using SemiHosting to exchange/transfer data from the arm-board to
> the PC.
SemiHosting is a way to tranfer/exchange data b/w arm-board and the PC.
We have an application USBConsole.exe running on the windows machine that controls/interfaces with the USB uint on the
arm board.
> Board details –
>
> Using ARM926e-js processor with 128MB SDRAM., Clock-33Mhz
>
> SDRAM Size = 128M
>
> CONFIG_PAGE_OFFSET = 0xc0000000
> CONFIG_PHYS_OFFSET= 0x80000000
> Kernel Lowmem = 32M including 8M for initramfs (starting from 24M to 32M).
> HighMEM is not configured.
> Vmalloc_start = end address of LowMem (i.e 0xC200000)
> VMALLOC_END = Vmalloc_start + 64M = 0xC6000000
>
> The SemiHosting(USB) drivers have read(); write(); seek(); functionalities
> along with an InitUSB function that initializes the semihosting USB
> hardware unit on the arm board.
Is this a USB host controller, or a device controller? Do you have a
pointer to where this code is somewhere so we can see what it does?
> Board details –
>
> Using ARM926e-js processor with 128MB SDRAM., Clock-33Mhz
>
> SDRAM Size = 128M
>
> CONFIG_PAGE_OFFSET = 0xc0000000
> CONFIG_PHYS_OFFSET= 0x80000000
> Kernel Lowmem = 32M including 8M for initramfs (starting from 24M to 32M).
> HighMEM is not configured.
> Vmalloc_start = end address of LowMem (i.e 0xC200000)
> VMALLOC_END = Vmalloc_start + 64M = 0xC6000000
>
> The SemiHosting(USB) drivers have read(); write(); seek(); functionalities
> along with an InitUSB function that initializes the semihosting USB
> hardware unit on the arm board.
pointer to where this code is somewhere so we can see what it does?
It is neither.,it is a hardware unit on the arm-board with a register set accesed by both arm and
the USBConsole.exe on the PC.This USBConsole.exe sets these registers appropriately.
> We are using kernel ioremap() function for accessing the USB register set,
> which is remaped to malloc section.
"gadget"?
> Functionality in semihosting init (InitUSB) function –
>
> 1. We send header command to hostPC via USB DMA operation by setting few
> USB registers.
Setting them on the board memory(USB register memory after virtually mapped)
> USB DMA takes the start address of the header and it’s size and these
> two params (addr, size) are set into corresponding USB registers.
>
> The USB transfer is enabled by setting USB_EN register to appropriate
> value.
>
>
>
> 2.After header transfer acknowledgement from hostPC should be received.
>
> As acknowledgement , hostPC should set INTC_USB register, we poll for
> this register and once this is set we are done with the initialisation.
>
> I wanted to test if the InitUSB function is working as expected. So I
> called this function in the start_kernel(after Console_Init()).
>
> As this function is just setting few registers and polling for few
> registers., I io_remaped this register set in the InitUSB function..
>
> But the INTC_USB register that is set by the hostPC as acknowledgement is
> not getting set and the code is never coming out of the while loop.
>
> USB DMA takes the start address of the header and it’s size and these
> two params (addr, size) are set into corresponding USB registers.
>
> The USB transfer is enabled by setting USB_EN register to appropriate
> value.
>
>
>
> 2.After header transfer acknowledgement from hostPC should be received.
>
> As acknowledgement , hostPC should set INTC_USB register, we poll for
> this register and once this is set we are done with the initialisation.
>
> I wanted to test if the InitUSB function is working as expected. So I
> called this function in the start_kernel(after Console_Init()).
>
> As this function is just setting few registers and polling for few
> registers., I io_remaped this register set in the InitUSB function..
>
> But the INTC_USB register that is set by the hostPC as acknowledgement is
> not getting set and the code is never coming out of the while loop.
>
Can a USBConsole.exe running on the windows machine access register on the arm-board running on the linux.??
>
> As mentioned I am calling the Init_USB function in the start_kernel(after
> Console_Init()).
> As mentioned I am calling the Init_USB function in the start_kernel(after
> Console_Init()).
On Fri, Mar 9, 2012 at 8:34 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
On Fri, Mar 09, 2012 at 03:49:57PM +0530, KARTHIK SEKURU wrote:What is SemiHosting?
> Hi,
>
> I am new to linux-kernel and am using kernel 3.1.6 and working on
> arm-SemiHosting(through USB) drivers.
>
> We are using SemiHosting to exchange/transfer data from the arm-board to
> the PC.
Is this a USB host controller, or a device controller? Do you have a
> Board details –
>
> Using ARM926e-js processor with 128MB SDRAM., Clock-33Mhz
>
> SDRAM Size = 128M
>
> CONFIG_PAGE_OFFSET = 0xc0000000
> CONFIG_PHYS_OFFSET= 0x80000000
> Kernel Lowmem = 32M including 8M for initramfs (starting from 24M to 32M).
> HighMEM is not configured.
> Vmalloc_start = end address of LowMem (i.e 0xC200000)
> VMALLOC_END = Vmalloc_start + 64M = 0xC6000000
>
> The SemiHosting(USB) drivers have read(); write(); seek(); functionalities
> along with an InitUSB function that initializes the semihosting USB
> hardware unit on the arm board.
pointer to where this code is somewhere so we can see what it does?
Are these are the USB controller's register set for a host device, or a
> We are using kernel ioremap() function for accessing the USB register set,
> which is remaped to malloc section.
"gadget"?
Setting them where?
> Functionality in semihosting init (InitUSB) function –
>
> 1. We send header command to hostPC via USB DMA operation by setting few
> USB registers.
I think a pointer to the code would be the easiest for us to understand
> USB DMA takes the start address of the header and it’s size and these
> two params (addr, size) are set into corresponding USB registers.
>
> The USB transfer is enabled by setting USB_EN register to appropriate
> value.
>
>
>
> 2.After header transfer acknowledgement from hostPC should be received.
>
> As acknowledgement , hostPC should set INTC_USB register, we poll for
> this register and once this is set we are done with the initialisation.
>
> I wanted to test if the InitUSB function is working as expected. So I
> called this function in the start_kernel(after Console_Init()).
>
> As this function is just setting few registers and polling for few
> registers., I io_remaped this register set in the InitUSB function..
>
> But the INTC_USB register that is set by the hostPC as acknowledgement is
> not getting set and the code is never coming out of the while loop.
>
> Now, I wanted to know if the place from where the InitUSB() function is
> called is the culprit and due to it if I am not receiving acknowledgement
> from the PC.
>
> As mentioned I am calling the Init_USB function in the start_kernel(after
> Console_Init()).
exactly what is going on here. Also, USB specific questions are best
asked on the linux-usb@xxxxxxxxxxxxxxx mailing list, have you tried
there?
thanks,
greg k-h
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