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/**
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/**
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 * Initializes the SGCN serial driver.
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 * Initializes the SGCN serial driver.
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 */
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 */
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int sgcn_init(void)
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int sgcn_init(void)
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{
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{
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    sram_virt_addr = (uintptr_t) as_get_mappable_page(
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    sram_virt_addr = (uintptr_t) as_get_mappable_page(sysinfo_value("sram.area.size"));
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        sysinfo_value("sram.area.size"));
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    int result = physmem_map(
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        (void *) sysinfo_value("sram.address.physical"),
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    if (physmem_map((void *) sysinfo_value("sram.address.physical"),
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        (void *) sram_virt_addr,
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        sysinfo_value("sram.area.size") / PAGE_SIZE,
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        (void *) sram_virt_addr, sysinfo_value("sram.area.size") / PAGE_SIZE,
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        AS_AREA_READ | AS_AREA_WRITE
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        AS_AREA_READ | AS_AREA_WRITE) != 0)
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        );
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    if (result != 0) {
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        printf("SGCN: uspace driver couldn't map physical memory: %d\n",
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            result);
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        return -1;
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    }
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    serial_console_init(sgcn_putc, WIDTH, HEIGHT);
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    serial_console_init(sgcn_putc, WIDTH, HEIGHT);
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    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
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    sram_buffer_offset = sysinfo_value("sram.buffer.offset");
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